GraphQL is an open-source query language. It is used for the development and operation of API.
Thanks to GraphQL, it is possible to organize the creation, reading, storage and deletion of data from the application.
GraphQL works with applications, not databases. This means that the sources of information are not important to the system, it is enough just to know the endpoint that stores the requested information.
The main advantage of GraphQL is that the user gets exactly the information they are requesting, without unnecessary information and wasting time.
It is widely used in Free TON.