Full Form of API :
Application Program Interface
API Full Form is Application Program Interface. It is a group of protocols, tools and routines used to build application software. Programmers use API to develop programs through various building blocks which they put together to present software. API determines the interaction of software components and it is mainly used for Graphical User Interface or GUI programs.
There are variations in API based on the web applications and operating systems. If one has Windows there is a set of API designed to work with the relevant applications and hardware. For example, it is the AIP which allows the action of copying and pasting a text between two applications. Today’s world has specific APIs for specific websites. For instance, APIs of eBay or Amazon let developers create individual web stores using the retail infrastructure that already exists.