GraphQL is a query language developed by Facebook; It has become popular for retrieving data over HTTP from various backends/databases under a single API (or even databases directly). That is, data is accessible from potentially different sources under a single query language. There are libraries, for both server and client functions, in many languages, including Java, Python, C/C++, JavaScript, etc.
Why GraphQL? The main advantage of GraphQL is the ability for the client to decide what information is returned by a single query....