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Postman is a popular API testing tool used by software professionals to test the performance of web services and applications. It allows users to create complex HTTP/REST requests quickly, as well as run automated tests for APIs. Postman includes features such as variable and environment support, request and response data validation, pre-request scripts, pass/fail - tests, visualizing and debugging requests, saving requests as collections, and more. Postman is available as a desktop application for Windows, Ne, macOS, and Linux, as well as a Chrome browser extension and mobile apps.