API, an abbreviation of application program interface, is a set of routines, protocols, and tools for building software applications. A good API makes it easier to develop a program by providing all the building blocks. A programmer then puts the blocks together.









Most operating environments, such as MS-Windows,
provide an API so that programmers can write applications consistent
with the operating environment. Although APIs are designed for
programmers, they are ultimately good for users
because they guarantee that all programs using a common API will have
similar interfaces. This makes it easier for users to learn new
programs.

thanks for the information attacker.