GraphQL is a query language for APIs and a runtime for executing those queries with your existing data. It enables clients to request only the data they need, making APIs more efficient and flexible compared to traditional REST approaches.

Features of GraphQL:

• Allows precise data fetching to avoid over-fetching and under-fetching.
• Single endpoint for all queries, mutations, and subscriptions.
• Strongly typed schema that defines the structure of available data.
• Works seamlessly with existing backends and supports multiple programming languages.

To check the installed GraphQL version (Node.js), run: npm list graphql.

Disclaimer: GraphQL is an open-source project originally developed by Facebook and now maintained by the GraphQL Foundation. It is provided under the MIT license and should be used following best practices for secure and efficient API design. GraphQL is provided "as is," without any warranty, express or implied. Users are responsible for the ethical and legal use of GraphQL in their applications.