what does API means?

[KenKraken]

i have heard this word a lot
what does it mean?

 

[nebrethar]

application program interface
API, an abbreviation of application program interface, is a set of routines, protocols, and tools for building software applications. The API specifies how software components should interact and are used when programming graphical user interface (GUI) components.

Source: Googling "API meaning"

 

[MADVIU]

Application programme interface... Google.com my friend.