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(Application Programming Interface) A language and message format used by an application program to communicate with the operating system or some other control program such as a database management system (DBMS) or communications protocol. APIs are implemented by writing function calls in the program, which provide the linkage to the required subroutine for execution.

API
Technical Diagram of the role of an API in client-server network communication http://homepage.smc.edu/morgan_david/cs70/sockets.htm

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