How to distinguish GraphQL from REST and in which cases it is preferable to use them?

GraphQL and REST are two approaches to organizing client-server interactions.

Differences:

• REST uses fixed endpoints and HTTP methods (GET, POST, PUT, DELETE). Each endpoint returns a predefined set of data.
• GraphQL provides a single endpoint where the client constructs the query, specifying exactly which fields and related data it needs.

When to use:

• REST is suitable for simple APIs with fixed resources and when caching and simplicity are important.
• GraphQL is convenient when clients need different sets of data to avoid redundant requests and reduce the number of server calls.

Example: In a mobile app with different screens where data varies greatly, GraphQL allows fetching exactly what is needed without excess. In a simple CRUD application, REST will be easier and more understandable.