An API, or application programming interface, is a set of rules and protocols for building and interacting with software applications. APIs act as intermediaries, allowing two different applications to communicate with each other. Developers use APIs to bridge the gaps between small, discrete chunks of code in order to create applications that are powerful, resilient, secure, and able to meet user needs. Even though you can't see them, APIs are everywhere—working continuously in the background to power the digital experiences that are essential to our modern lives. API An application programming interface (API) is a connection between computers or between computer programs. It is a type of software interface, offering a service to other pieces of software. [1][2] A document or standard that describes how to build such a connection or interface is called an API specification. API Definition - What is an API, and what does an API do? Stands for Application Programming Interface. An API is a set of commands, functions, protocols, and objects that programmers can use to create software or interact with an external system. An API (Application Programming Interface) is a mechanism that allows different software systems to interact with each other. It defines how a client can request data or services from a server without needing to know its internal implementation. API stands for Application Programming Interface. In the context of APIs, the word Application refers to any software with a distinct function. Interface can be thought of as a contract of service between two applications. This contract defines how the two communicate with each other using requests and responses. A system access point or library function that has a well-defined syntax and is accessible from application programs or user code to provide well-defined functionality. What is an API? An API, or application programming interface, is a set of rules or protocols that enables software applications to communicate with each other to exchange data, features and functionality. APIs work behind the scenes to power almost everything that you do online. An Application Programming Interface (API), in the simplest terms, is a messenger that allows different software applications to communicate with each other. In technical terms, an API is a set of rules and tools that lets one application request data or services from another. For example, when you use a weather app to check the forecast, the app uses an API to fetch the latest weather data from a server.