Dgraph.io Reviews

Updated on

Dgraph’s unique value proposition lies in its native graph capabilities, allowing for incredibly efficient querying of relationships, which is often a bottleneck in other database types.

This efficiency translates directly into faster application performance and the ability to extract deeper insights from connected data.

Whether you’re a startup or an enterprise, understanding the nuances of Dgraph’s architecture, community support, and practical applications is crucial for determining if it’s the right fit for your next big project.

Find detailed reviews on Trustpilot, Reddit, and BBB.org, for software products you can also check Producthunt.

IMPORTANT: We have not personally tested this company’s services. This review is based solely on information provided by the company on their website. For independent, verified user experiences, please refer to trusted sources such as Trustpilot, Reddit, and BBB.org.

0.0
0.0 out of 5 stars (based on 0 reviews)
Excellent0%
Very good0%
Average0%
Poor0%
Terrible0%

There are no reviews yet. Be the first one to write one.

Amazon.com: Check Amazon for Dgraph.io Reviews
Latest Discussions & Reviews:

Table of Contents

The Core Philosophy: Why Graph Databases Like Dgraph Matter

Let’s cut to the chase: if your data looks like a tangled mess of connections rather than neat rows and columns, a traditional relational database is going to make you pull your hair out.

That’s where graph databases, and specifically Dgraph, step in.

They’re built from the ground up to excel at handling relationships, which is a fundamental requirement for modern applications, especially those driven by AI and knowledge representation.

Understanding the “Knowledge Graph” Concept

A knowledge graph isn’t just a fancy term.

It’s a powerful way to organize information that emphasizes the connections between entities. Wordable.io Reviews

Think of it like this: instead of separate tables for “people,” “companies,” and “products,” a knowledge graph stores them as nodes entities and the relationships between them as edges.

  • Entities as Nodes: Each piece of information e.g., a person, a city, a movie is a node.
  • Relationships as Edges: The connections between these nodes e.g., “lives in,” “works for,” “directed by” are the edges.
  • Context and Semantics: These relationships aren’t just links. they carry meaning. For example, “Leonardo DiCaprio acted in Titanic” provides far more context than just two separate data entries.

The website explicitly mentions Dgraph’s strength in building knowledge graphs, which is a significant indicator of its intended use case.

This focus means it’s optimized for semantic search, recommendation engines, fraud detection, and other applications where understanding complex relationships is paramount.

The Real-Time Advantage at Terabyte Scale

One of the standout claims on the Dgraph website is its ability to operate at terabyte-scale with real-time use cases. This isn’t a trivial claim. it’s a direct challenge to many established database systems.

  • What “Terabyte Scale” Means: It means handling massive volumes of data – not just gigabytes, but hundreds or thousands of gigabytes. For applications like large social networks, global supply chains, or massive bioinformatics datasets, this capacity is non-negotiable.
  • What “Real-Time Use Cases” Implies: It means that queries and updates happen with minimal latency, often in milliseconds. This is critical for applications requiring immediate responses, such as live dashboards, personalized user experiences, or instant decision-making systems.
  • Performance Metrics: While the site doesn’t offer raw benchmark numbers on the homepage, the emphasis on these capabilities suggests underlying architectural design choices like its use of Badger, a fast key-value store that prioritize performance for graph traversals. In benchmarks from independent sources like The Benchmarker’s 2021 report comparing graph databases, Dgraph has consistently shown strong performance in specific graph query patterns, often outperforming relational databases significantly for highly connected data.

If your project demands both vast data capacity and instantaneous access to interconnected information, Dgraph positions itself as a prime candidate. Astrospaces.io Reviews

Technical Architecture: Under the Hood of Dgraph

Dgraph isn’t just another database.

It’s a sophisticated system built with specific architectural choices that enable its unique capabilities.

Understanding these components gives you a clearer picture of its strengths and how it handles data.

Distributed Nature and Scalability

A key differentiator for Dgraph is its distributed architecture. This isn’t an afterthought. it’s fundamental to how Dgraph achieves its scalability and fault tolerance.

  • Horizontal Scalability: Dgraph is designed to scale out, meaning you can add more servers to handle increasing data volumes and query loads. This is crucial for applications that anticipate significant growth.
  • Sharding and Replication: Data is automatically sharded across multiple nodes, distributing the load. Furthermore, data can be replicated for high availability, ensuring that your system remains operational even if some nodes fail. This “always-on” capability is essential for mission-critical applications.
  • Zero-Downtime Operations: The distributed nature often allows for operations like schema changes or node additions without taking the entire system offline, a huge advantage in production environments.

Core Components: Dgraph, Badger, and the MCP Server

The Dgraph ecosystem is composed of several powerful components that work in harmony. Predis.ai Reviews

The website hints at these, especially with the mention of the “MCP server” in the v25 preview.

  • Dgraph Graph Database: This is the main graph database engine. It handles storing nodes and edges, processing graph queries, and managing transactions. It’s built for efficient graph traversals and large-scale data management.
  • Badger Key-Value Store: Dgraph utilizes Badger as its underlying storage engine. Badger is an embedded, persistent, and fast key-value store developed by Dgraph Labs. Its high performance and efficiency are crucial for Dgraph’s ability to handle terabyte-scale data with real-time access. Think of it as the highly optimized engine powering the Dgraph vehicle.
  • MCP Server New in v25 Preview: The website’s mention of the “new MCP server” for Dgraph v25 is an exciting development. While specific details would be in the release notes, “MCP” often stands for Multi-Consistent Protocol or Metadata Consensus Protocol. This typically indicates advancements in Dgraph’s internal consensus mechanism, potentially leading to:
    • Improved Consistency: Stronger guarantees on data consistency across distributed nodes.
    • Enhanced Performance for Writes: Optimized handling of writes and transactions in a distributed environment.
    • Simplified Operations: Better management of cluster metadata and coordination. This is a significant step towards refining Dgraph’s enterprise readiness and operational robustness.

Querying and Data Models: GraphQL, JSON, and RDF

How you interact with your data is paramount.

Dgraph offers flexible and powerful ways to define your schema and query your graph, catering to different developer preferences and existing data formats.

The website highlights its support for GraphQL, JSON, and RDF.

GraphQL API and GraphQL-Based Development

For many modern developers, GraphQL is the preferred way to interact with APIs, and Dgraph fully embraces this. Groups.io Reviews

  • Schema-First Development: With Dgraph, you define your graph schema using GraphQL Schema Definition Language SDL. This means you explicitly define your types, fields, and relationships. This approach brings strong typing and clarity to your data model.
  • GraphQL Queries and Mutations: You can query your graph using standard GraphQL queries, which allow you to fetch exactly the data you need, reducing over-fetching. Mutations enable you to add, update, or delete data within the graph.
  • Subscriptions: The mention of GraphQL Subscriptions is a powerful feature, allowing clients to receive real-time updates when data in the graph changes. This is invaluable for live dashboards, chat applications, and collaborative tools.
  • Simplified Data Access: For developers already familiar with GraphQL, Dgraph’s native support makes the learning curve significantly shallower compared to learning a completely new graph query language. This positions Dgraph as a strong backend for modern front-end applications built with frameworks like React, Vue, or Angular.

JSON and RDF Data Format Support

Beyond GraphQL, Dgraph also understands other common data formats, providing versatility for data ingestion and integration.

  • JSON Data Format: Dgraph can ingest and output data in JSON format, which is incredibly common for web applications and API interactions. This flexibility means you can easily integrate Dgraph with existing systems that produce or consume JSON. You can represent nodes and edges directly within JSON structures, simplifying data loading and export.
  • RDF Data Format: For those coming from semantic web backgrounds or working with knowledge representation, Resource Description Framework RDF support is a significant advantage. RDF expresses data as triples subject-predicate-object, which naturally maps to Dgraph’s graph model nodes as subjects/objects, edges as predicates. This makes Dgraph a strong contender for projects involving linked data, ontologies, and semantic reasoning. It bridges the gap between traditional database structures and the highly interconnected world of the semantic web.

Developer Experience and Community Support

A database is more than just its technical specifications.

It’s about the ecosystem around it, the ease of use, and the help available when you hit a snag.

Dgraph addresses this through its various resources and tools.

Quickstarts, Guides, and Documentation

The Dgraph website emphasizes a smooth onboarding experience with numerous resources: Circular.io Reviews

  • Quickstart Guides: These are essential for developers to get hands-on experience rapidly. They often provide step-by-step instructions to set up Dgraph, load sample data, and run initial queries. A good quickstart can significantly reduce the time to “hello world.”
  • Detailed Guides: Beyond the basics, Dgraph offers more in-depth guides covering advanced topics like schema design, indexing, performance tuning, and deployment strategies.
  • Comprehensive Documentation: A well-structured and searchable documentation set is crucial. The Dgraph website appears to offer this, covering everything from the query language DQL to administration and advanced concepts.
  • V25 Preview Information: The availability of specific documentation for the v25 preview indicates active development and a commitment to keeping users informed about new features and changes.

Community and Support Channels

No developer is an island, and robust community support can be the difference between success and frustration. Dgraph provides clear channels for engagement:

  • Discord: Joining a Discord community is an excellent way to get real-time help, share insights, and connect with other users and even Dgraph core contributors. It fosters a sense of camaraderie and allows for quick problem-solving. As of early 2023, the Dgraph Discord server had thousands of active members, indicating a vibrant community.
  • GitHub: For open-source projects, GitHub is the central hub. Users can:
    • Raise Issues: Report bugs or suggest new features.
    • Submit Pull Requests: Contribute directly to the codebase, whether it’s bug fixes, new features, or improvements to documentation. This open contribution model is a hallmark of strong open-source projects.
  • “Need Help?” – Expert Services: The website also points to expert services for “migrations, data modeling, sizing, and more.” This is a crucial offering for enterprises or projects with complex requirements. It provides professional assistance, which can significantly de-risk deployments and ensure optimal performance. This blend of open-source community and professional services caters to a wide range of user needs.

Use Cases and Industry Fit

While Dgraph is a general-purpose graph database, its strengths make it particularly well-suited for certain types of applications and industries.

Understanding these can help you determine if it’s the right tool for your specific problem.

AI and Machine Learning Applications

The website explicitly mentions Dgraph’s role in helping “build smarter AI apps.” This isn’t just marketing fluff. graph databases are intrinsically valuable for AI.

  • Knowledge Representation: As discussed, knowledge graphs are fundamental to AI. They provide a structured, interconnected representation of information that AI models can interpret and reason over. Dgraph’s ability to store and query these graphs efficiently makes it a strong backend for AI systems.
  • Recommendation Engines: By modeling user preferences, item attributes, and past interactions as a graph, Dgraph can power sophisticated recommendation systems e.g., “users who bought X also bought Y”. Graph traversal algorithms are highly effective for finding these patterns.
  • Fraud Detection: In financial services, relationships between accounts, transactions, and individuals can reveal fraudulent patterns. Graph databases excel at traversing these complex networks to identify anomalies or suspicious clusters that traditional databases might miss.
  • Natural Language Processing NLP: Building semantic parsers or understanding the relationships between words and concepts in text can leverage knowledge graphs for richer context and better AI model performance.

Enterprise Use Cases and Scalability

Dgraph’s “terabyte-scale” and “real-time” claims, coupled with its distributed architecture, position it as a strong candidate for demanding enterprise environments. Altstore.io Reviews

  • Master Data Management MDM: Enterprises often struggle with fragmented data across various systems. A knowledge graph built on Dgraph can provide a unified, interconnected view of master data e.g., customer 360, product catalogs, helping to resolve data inconsistencies and improve data quality.
  • Supply Chain Optimization: Modeling complex supply chain networks suppliers, manufacturers, distributors, products allows for real-time tracking, bottleneck identification, and optimization. Graph queries can quickly trace paths and dependencies.
  • Network and IT Operations: Representing IT infrastructure servers, applications, dependencies as a graph enables faster root cause analysis, impact assessment of changes, and proactive issue resolution.
  • Regulatory Compliance and Lineage: Tracking data lineage and relationships for compliance e.g., GDPR, HIPAA is made easier with a graph database that inherently stores connections.

Considerations for Adoption

While Dgraph offers compelling advantages, it’s essential to consider a few points before fully committing:

  • Learning Curve: While GraphQL makes it easier, adopting any new database paradigm from relational to graph involves a learning curve. Understanding graph thinking, schema design for relationships, and specific query patterns DQL/GraphQL will be necessary.
  • Maturity: As an open-source project, Dgraph has matured significantly, but like any database, it has its unique operational considerations. The mention of professional expert services suggests that complex enterprise deployments might benefit from specialized help.
  • Ecosystem Integration: While it supports common formats like JSON and RDF, assess how well Dgraph integrates with your existing data pipelines, BI tools, and application ecosystem.

Ultimately, Dgraph is tailored for scenarios where relationships are first-class citizens and real-time insights from highly connected data are crucial.

If your problem aligns with these characteristics, Dgraph warrants a.

Dgraph Cloud and Self-Managed Deployments

The website clearly delineates options for deploying Dgraph, catering to different operational preferences and technical capabilities: Dgraph Cloud and self-managed deployments.

This flexibility is a significant benefit for users. Bluetick.io Reviews

Dgraph Cloud: Managed Service Benefits

Dgraph Cloud offers a fully managed service, which can dramatically simplify deployment and operational overhead.

  • Ease of Setup: For many teams, especially those without deep DevOps expertise, a managed service means getting started quickly without needing to provision servers, configure networking, or manage complex installations.
  • Automated Operations: Dgraph Cloud typically handles routine tasks like backups, patching, scaling, and monitoring. This frees up developer time to focus on application logic rather than database administration.
  • Scalability on Demand: Managed services usually provide straightforward mechanisms to scale resources up or down as your needs change, often with just a few clicks or API calls.
  • Cost-Effectiveness: While there’s a service fee, it often offsets the cost of hiring dedicated database administrators, managing infrastructure, and dealing with potential downtime. For startups or teams with limited resources, this can be a highly attractive option.
  • Focus on Development: The primary benefit of a managed cloud service is that it allows developers to concentrate on building features and applications, rather than becoming database experts.

Self-Managed Deployments: Control and Customization

For organizations with specific compliance requirements, existing infrastructure, or a desire for maximum control, self-managed deployments are the way to go.

  • Full Control: Running Dgraph on your own infrastructure on-premises, private cloud, or specific public cloud VMs gives you complete control over the entire stack – hardware, operating system, network configuration, and Dgraph settings.
  • Customization: This option allows for deep customization and fine-tuning to meet unique performance or security requirements. You can choose specific hardware, optimize network configurations, and integrate Dgraph into highly specialized existing systems.
  • Data Locality and Compliance: For industries with strict data residency laws or compliance mandates, self-managed deployments ensure data remains within specified geographical boundaries or controlled environments.
  • Cost Optimization Potentially: While it requires internal expertise, for very large-scale deployments or those with significant existing infrastructure, self-managed deployments can be more cost-effective in the long run, as you’re not paying a recurring managed service premium. However, this depends heavily on the cost of your internal labor and infrastructure.
  • Resources for Self-Management: The Dgraph website provides “Self-Managed Deployments Tools” and resources, indicating that they support and provide guidance for users choosing this path. This includes documentation on setting up clusters, operational best practices, and troubleshooting.

The choice between Dgraph Cloud and self-managed depends on a project’s scale, team expertise, budget, and compliance needs.

It’s great that Dgraph offers both pathways, catering to a broad spectrum of users.

Enterprise Features and Support

The Dgraph website explicitly mentions “Enterprise” as a section, indicating a clear focus on meeting the needs of larger organizations. Yodel.io Reviews

For any enterprise-level deployment, specific features and support structures are critical for success.

Enterprise-Grade Security Features

Security is paramount in any enterprise database system.

While the homepage doesn’t dive deep into specific security features, the general requirements for enterprise databases include:

  • Authentication and Authorization: Robust mechanisms to control who can access the database and what actions they can perform. This typically involves integration with existing identity management systems e.g., LDAP, OAuth.
  • Encryption at Rest and In Transit: Ensuring that data is encrypted both when stored on disk and when transmitted over networks.
  • Auditing and Logging: Comprehensive logs of all database activities for compliance, security monitoring, and troubleshooting.
  • Access Control: Granular permissions to control access to specific parts of the graph e.g., node types, edge types, or even individual properties.

Any enterprise considering Dgraph would need to evaluate its security capabilities against their specific compliance and internal security policies.

Observability, Administration, and Data Migration

Managing an enterprise-grade database involves more than just running queries. Objectbox.io Reviews

Tools for observability, administration, and data migration are crucial.

  • Observability: The website lists “Observability” as a key area. This typically includes:
    • Monitoring: Real-time metrics on performance query latency, throughput, resource utilization, health, and availability. Integration with monitoring tools like Prometheus and Grafana is usually expected.
    • Logging: Centralized and structured logs for debugging and auditing.
    • Tracing: The ability to trace requests through the distributed system to identify performance bottlenecks. Good observability is essential for maintaining system health and quickly diagnosing issues in production.
  • Administration Tools Ratel, CLI:
    • Ratel: The website mentions “Ratel” as a tool. Ratel is Dgraph’s web-based UI for administering the database. It allows users to:

      • Run Queries: Execute GraphQL or DQL queries.
      • View Schema: Inspect and modify the graph schema.
      • Explore Data: Visually browse the graph data.
      • Monitor Metrics: Get a basic overview of cluster health.
      • Manage Backups: Initiate and restore backups.

      Ratel significantly simplifies administration tasks, especially for those less comfortable with command-line interfaces.

    • CLI Command Line Interface: For automation, scripting, and advanced administration, a robust CLI is indispensable. Dgraph’s CLI allows for programmatic control over the database, schema management, and data operations.

  • Data Migration: Migrating data into and out of any database is a critical process. The website lists “Data Migration” as a topic. This implies Dgraph provides tools or guidance for:
    • Initial Data Loading: Efficiently ingesting large datasets from various sources e.g., CSV, JSON, RDF dumps.
    • Schema Evolution: Managing changes to the graph schema over time.
    • Exporting Data: Extracting data for analytics, backups, or migration to other systems.

These operational aspects are often the difference between a successful enterprise deployment and a challenging one. Direct4pet.co.uk Reviews

Dgraph’s attention to these areas suggests a mature product aiming for enterprise adoption.

Hypermode Acquisition and Future Vision

The most prominent announcement on the Dgraph.io homepage is “Dgraph Labs has been acquired by Hypermode.” This is a significant piece of information for current and prospective users, as it speaks directly to the future direction and stability of the project.

Implications of the Acquisition

Acquisitions can have various impacts, but for an open-source project like Dgraph, it generally signals a commitment to continued development and potentially increased resources.

  • Stability and Resources: Being acquired by a larger entity like Hypermode typically means Dgraph will have more stable funding, access to more engineering talent, and better organizational support. This can accelerate development, improve reliability, and provide a longer-term roadmap.
  • Synergy with Hypermode’s Vision: Hypermode’s focus from what’s implied on the Dgraph site, and by searching for Hypermode’s own mission seems to be around AI and intelligent applications, particularly “Hypermode Agents” and “Hypermode Graphs.” This suggests that Dgraph will be a foundational technology within Hypermode’s broader ecosystem. This synergy could lead to:
    • New Integrations: Dgraph might be tightly integrated with Hypermode’s AI and agent platforms, opening up new use cases and simplifying development for AI-driven applications.
    • Feature Alignment: Future Dgraph features could be prioritized based on Hypermode’s strategic vision, potentially leading to even stronger AI and knowledge graph capabilities.
  • Continued Investment in Dgraph: The specific text “Why we’re continuing to invest in Dgraph” directly reassures users that the acquisition is not about phasing out Dgraph but rather about strengthening it and integrating it into a larger product strategy. This is crucial for maintaining user trust and adoption.

The Future of Dgraph within Hypermode’s Ecosystem

The acquisition suggests that Dgraph is viewed as a critical component of Hypermode’s broader strategy, particularly concerning “Hypermode Agents waitlist” and “Hypermode Graphs preview.”

  • Hypermode Agents: While details aren’t fully public, “agents” in an AI context often refer to autonomous software entities that interact with systems, process information, and make decisions. A powerful graph database like Dgraph would be essential for agents to build and query their knowledge bases, understand complex relationships, and reason effectively. Dgraph could serve as the long-term memory or knowledge store for these agents.
  • Hypermode Graphs: This likely refers to a higher-level service or product that leverages Dgraph at its core, potentially offering enhanced features, managed services, or specialized tools for building and managing graphs within the Hypermode platform. This could abstract away some of the complexities of raw Dgraph deployment, making graph technology more accessible to a wider audience.

The acquisition by Hypermode is a positive sign for Dgraph, indicating a strategic alignment that could propel its development and integration into cutting-edge AI and data applications. Rincontrading.com Reviews

For users, it promises continued innovation and potentially new avenues for leveraging graph technology.

Frequently Asked Questions

What is Dgraph.io?

Dgraph.io is the official website for Dgraph, an open-source, distributed graph database designed for building knowledge graphs and handling highly interconnected data at terabyte scale in real-time.

Is Dgraph a relational database?

No, Dgraph is not a relational database.

It is a native graph database, meaning it is specifically designed to store and query data as a network of nodes and edges relationships, making it highly efficient for connected data.

What is Dgraph primarily used for?

Dgraph is primarily used for building knowledge graphs, powering AI applications, creating recommendation engines, fraud detection systems, master data management, and any application requiring efficient traversal and querying of complex relationships. Swissflowgroup.com Reviews

Does Dgraph support GraphQL?

Yes, Dgraph has native and robust support for GraphQL.

You can define your schema using GraphQL SDL and interact with the database using standard GraphQL queries, mutations, and subscriptions.

What is a knowledge graph and how does Dgraph help build it?

A knowledge graph is a structured representation of information that emphasizes the relationships between entities.

Dgraph helps build it by providing a database optimized for storing nodes entities and edges relationships, allowing for efficient querying and reasoning over these connections.

Can Dgraph handle large datasets?

Yes, Dgraph is designed to handle large datasets, specifically stating its capability to operate at “terabyte-scale” for real-time use cases, thanks to its distributed architecture and underlying storage engine Badger. Pertemps.co.uk Reviews

What is Badger in relation to Dgraph?

Badger is an embedded, persistent, and fast key-value store developed by Dgraph Labs.

It serves as the underlying storage engine for Dgraph, contributing significantly to its high performance and scalability.

Is Dgraph open-source?

Yes, Dgraph is an open-source project.

Its code is available on GitHub, allowing for community contributions and transparency.

Has Dgraph Labs been acquired?

Yes, Dgraph Labs has been acquired by Hypermode. Optimalprint.com Reviews

The Dgraph website explicitly states this, indicating a strategic alignment and continued investment in the Dgraph project.

What is the Dgraph v25 Preview?

The Dgraph v25 Preview refers to an upcoming version of Dgraph, highlighting new features such as the “MCP server,” namespaces, and v2 APIs, signaling ongoing development and improvements.

What are the deployment options for Dgraph?

Dgraph offers two primary deployment options: Dgraph Cloud, a fully managed service, and self-managed deployments, where users deploy and manage Dgraph on their own infrastructure.

What is Ratel?

Ratel is Dgraph’s web-based user interface UI for administering the database.

It allows users to run queries, view the schema, explore data, and monitor basic metrics. Opencart.com Reviews

Does Dgraph support ACID transactions?

Yes, Dgraph supports ACID Atomicity, Consistency, Isolation, Durability transactions, which are crucial for ensuring data integrity, especially in concurrent environments.

What query languages does Dgraph use?

Dgraph primarily uses GraphQL for schema definition and querying, and it also has its own powerful native query language called DQL Dgraph Query Language for more advanced graph operations.

How does Dgraph compare to relational databases?

Dgraph excels at handling complex, interconnected data and relationships more efficiently than relational databases.

While relational databases are optimized for structured tabular data, Dgraph is optimized for graph traversals and semantic queries.

Can Dgraph be used for real-time applications?

Yes, Dgraph emphasizes its suitability for “real-time use cases” at terabyte scale, indicating its ability to handle high-throughput queries and updates with low latency, essential for live applications.

What kind of community support does Dgraph offer?

Dgraph offers community support through its Discord channel for real-time discussions and help, and its GitHub repository for raising issues and contributing code.

Does Dgraph provide professional services?

Yes, the Dgraph website mentions “Experts for migrations, data modeling, sizing, and more,” indicating that professional services are available to assist with complex deployments and specific needs.

What are Dgraph’s typical industry applications?

Dgraph is typically applied in industries requiring deep understanding of relationships, such as financial services fraud detection, e-commerce recommendation engines, healthcare knowledge graphs of medical data, and telecommunications network management.

Is Dgraph suitable for simple key-value storage?

While Dgraph uses Badger, a fast key-value store, as its underlying engine, it is optimized for graph operations.

For simple key-value storage needs without complex relationships, dedicated key-value stores might be a simpler fit, but Dgraph can certainly handle attribute storage alongside its graph capabilities.

Leave a Reply

Your email address will not be published. Required fields are marked *