Meaning – An application programinterface, or more commonly known as API, is a software interface, that allows applications to communicate with each other. Applications today have features that complement each other. Sometimes, one application needs to use the resource or feature on a companion application, in which case, there has to be communication between the two. The application program interface assists in this task.
An API also refers to the set of programming language constructs or statements that can be coded in an application program to obtain the specific functions and services provided by an underlying operating system or service program
Example of usage – “The API is as important as an application itself, as it allows apps to communicate with each other.”