Postman recently became a popular library used to design and test APIs, web apps, web products, startup products and data, machine learning products. Practically modern tech is all about web API calls.
Postman API suites in its own words
Use Postman Collections to keep your API requests and elements organized, to document APIs, for automated testing, and for lots more.
Comment: collections is a great way to organize your API requests, put them into folders. This is very useful for data scientists and machine learning practitioners.
Postman API Builder helps you define, develop, test, monitor, and manage your APIs faster.
Postman's mock servers simplify API design and planning, support split-stack development, and let you see exactly how your API will run — even before it's in production.
Postman API Monitoring allows you to review your API responses, availability, and performance with each run so you can ensure that your API is always healthy.