Instead, we build test suites called collections and let Postman interact with the API. While using Postman, for testing purposes, one doesn't need to write any HTTP client network code.It is a simple Graphic User Interface for sending and viewing HTTP requests and responses. Postman is a standalone software testing API (Application Programming Interface) platform to build, test, design, modify, and document APIs.All the examples in this tutorial are tested and can be imported in Postman. This tutorial will help in understanding why Postman is so famous and what makes it unique when compared to other API testing tools. With the help of this tool, developers can easily create, test, share, and document APIs. Postman is one of the most popular software testing tools which is used for API testing.