What does the Abreviation API mean ?

Answer 1

Applications Programming Interfaces ( API) is a set of subroutine definitions, communication protocols, and tools for building software. In general terms, it is a set of clearly defined methods of communication among various components. 

More information here :

https://en.m.wikipedia.org/wiki/Application_programming_interface

https://searchmicroservices.techtarget.com/definition/application-program-interface-API

Thanks

Answer 2

Thank You too, Prince