What is GraphQL, and how does it differ from REST?
GraphQL has been released simply as a specification, for a query language for APIs that allows clients to request exactly the data they need, nothing more and nothing less.
GraphQL server can be implemented in any preferred programming language.
Unlike REST, where multiple endpoints provide fixed data structures, GraphQL has a single endpoint and lets clients define the structure of the response.
This reduces the over-fetching and under-fetching of data.