API is the acronym for Application Programming Interface, which is a software intermediary that allows two applications to talk to each other. Each time you use an app like Facebook, send an instant message, or check the weather on your phone, you're using an API.

When should an API be used?

Microservices can actually use API to communicate between each other. API lets a developer make a specific “call” or “request” in order to send or receive information. This communication is done using a programming language called “JSON.” It can also be used to make a defined action such as updating or deleting data.

Where is API used?

Web applications use APIs to connect user-facing front ends with all-important back end functionality and data. Streaming services like Spotify and Netflix use APIs to distribute content. Automotive companies like Tesla send software updates via APIs. Others use APIs to unlock car data for third-parties.