A means of communication between two or more computer applications is an Application Programming Interface (API). It is a form of software interface that provides a service to other software applications. An API specification is a document or industry standard that outlines how to create or use a connection or interface of this type. A computer system is considered to implement or expose an API if it complies with this standard. API can be used to refer to both the specification and the implementation.

An application programming interface (API) links computers or pieces of software to one another as opposed to a user interface, which connects a computer to a human. The only person (the end user) who is supposed to utilize it is a computer programmer who is integrating it into the software. A programming language interface (API) frequently consists of various components that serve as tools or services for programmers. A program or programmer is said to invoke a particular section of the API when they use it. The calls that make up the API are sometimes referred to as endpoints, subroutines, methods, or requests. These calls are defined by an API specification, which means that it describes how to use or implement them.

The ability to expose only the elements of a system a programmer would find useful while hiding the internal workings of the system is one of the functions of APIs. This consistency is maintained even if the internal workings of the system change in the future. An API could be a shared standard enabling interoperability across multiple systems, or it could be specifically designed for a specific pair of systems.

When referring to online APIs, which enable communication between computers connected by the internet, the term API is frequently used. Additionally, programming languages, software libraries, computer operating systems, and computer hardware all have their own APIs. Although APIs were created in the 1940s, the term did not become popular until the 1960s and 1970s. Microservices, which are ultimately loosely connected services exposed by public APIs, are becoming more and more common as a result of recent advancements in the use of APIs.

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