Query vs Mutation

In tools like React Query, Apollo, and GraphQL, data operations are generally split into two categories:

• Query: Used for fetching or reading data from the server. Queries are generally idempotent (they don’t change the server state). Examples include GET requests, fetching a list of users, etc. In React Query, you handle this with the useQuery hook.
• Mutation: Used for modifying data on the server (creating, updating, or deleting). Examples include POST, PUT, PATCH, and DELETE requests. In React Query, you handle this with the useMutation hook.