What is API (Application Programming Interface)?
API (Application Programming Interface) is a set of functions and procedures allowing the creation of applications that access the features or data of an operating system, application, or other service. An API is a computing interface which defines interactions between multiple software intermediaries. It defines the kinds of calls or requests that can be made, how to make them, the data formats that should be used, the conventions to follow, etc. It can also provide extension mechanisms so that users can extend existing functionality in various ways and to varying degrees. An API (Application Programming Interface) can be entirely custom, specific to a component, or it can be designed based on an industry-standard to ensure interoperability. Through information hiding, APIs enable modular programming, which allows users to use the interface independently of the implementation.