API is a collection of programming code that allows data to be transferred between software products. API sends a user's response to a system and then returns the system's response to the client. While shopping, when you add your product to your cart, an API notifies the website, and your cart is refreshed.

An API "Application Programming Interface" is an operation set that enables programs to interface with independent software elements, operating systems, and microservices.

When it comes to APIs, you may hear people say "microservices." These, on the other hand, are not the same. Microservices is a design or architecture that separates the functionality of a web application. A web application's API is the mechanism by which programmers interact with it. In addition, microservices can use APIs to communicate with one another.