REST API is a set of function helps the developers performing requests when the response is receiving. Through HTTP protocol interaction is made in REST API.

REST is defined as Representational state transfer. It is an effective standard for API creation.

REST API, which stands for Representational State Transfer Application Programming Interface, is a type of web service architecture that follows the principles of REST. REST is an architectural style that uses a stateless, client-server communication model, and it typically relies on standard HTTP methods (such as GET, POST, PUT, and DELETE) for communication.

A REST API allows different software applications to communicate with each other over the internet using standard HTTP protocols. It is based on the concept of resources, which are identified by URIs (Uniform Resource Identifiers). Each resource can be manipulated using standard HTTP methods, and the communication is typically in a stateless manner, meaning each request from a client contains all the information needed to understand and fulfill that request.

In summary, a REST API is a set of rules and conventions for building and interacting with web services that adhere to the principles of REST. It provides a standardized way for different systems to communicate over the internet.