Postman is an API platform for building and using APIs. It simplifies each step of the API lifecycle and streamlines collaboration so you can create better APIs faster. Postman includes a comprehensive set of tools that help accelerate the API lifecycle, from design, testing, documentation, and mocking to the sharing and discoverability of your APIs. Some of the key features of Postman include:

• API Repository: Postman can store and manage API specifications, documentation, workflow recipes, test cases and results, metrics, and everything else related to APIs.
• API Client: The Postman API client is the foundational tool of Postman, and it enables you to easily explore, debug, and test your APIs while also enabling you to define complex API requests for HTTP, REST, SOAP, GraphQL, and WebSockets.
• Flows: Postman Flows is a visual tool for creating API workflows. You can use Flows to chain requests, handle data, and create real-world workflows in your Postman.
• Integration: Postman integrates with the most important tools in your software development pipeline to enable API-first practices.
• Free and Paid Plans: You can sign up and get started with Postman for free. Postman also offers a range of paid plans that give you and your team more advanced options and flexibility.

Postman is also used for API testing. It is an HTTP client that tests HTTP requests, utilizing a graphical user interface, through which we obtain different types of responses that need to be subsequently validated. Postman offers many endpoint interaction methods, including GET, POST, PUT, PATCH, and DELETE. When testing APIs with Postman, we usually obtain different response codes. Some of the most common include 100 Series, 200 Series, 300 Series, 400 Series, and 500 Series.