API stands for Application Programming Interface.
https://aws.amazon.com/what-is/api/
API is the acronym for Application Programming Interface, which is a software intermediary that allows two applications to talk to each other.
https://www.mulesoft.com/resources/api/what-is-an-api
An application programming interface, or API, enables companies to open up their applications’ data and functionality to external third-party developers, business partners, and internal departments within their companies.
https://www.ibm.com/topics/api
An application programming interface (API) is a way for two or more computer programs to communicate with each other.
https://en.wikipedia.org/wiki/API
An application program interface (API) is a set of routines, protocols, and tools for building software applications.
https://www.webopedia.com/definitions/api/

