Can you explain what GraphQL is and how it is used to fetch data?

GraphQL is a query language and runtime environment for APIs that allows clients to specify exactly what data they need and receive it in a single request. Unlike REST, where the server defines the data structure, in GraphQL the client constructs the query by describing the response structure.

Usage:

• The client sends a request with a description of the required fields.
• The server processes the request and returns only the requested data.

Example of a GraphQL query:

{
  user(id: "1") {
    name
    email
    posts {
      title
    }
  }
}

This query will return the name, email of the user with id=1, and the titles of their posts.

In Python, libraries such as gql or graphql-python can be used to work with GraphQL, allowing you to send requests and process responses.