Postman is a tool for interacting with and building APIs. Since REST APIs are key way to implement communication with Microservices in most of the cases, Postman is a suitable tool to test these services. Postman started as a Chrome plugin, but can be downloaded as a standalone version from www.getpostman.com. It is suitable for interacting with RESTful APIs, and the tools are available for free. Advanced interaction with Microservice APIs is performed with and demonstrated on Postman in this book.