Explain API testing with an example API testing, or Application Programming Interfaces testing is a kind of software testing that involves verifying and validating APIs and Web services. It’s also a part of integration testing which determines whether the developed APIs meet the tester’s pre-established expectations, such as functionality, reliability, performance, or security. API testing is entirely different from testing. While GUI testing mainly focuses on the functions of an application that are visible to the users, API testing primarily centers on the logic layer of the software architecture。 There is one exmaple that we can relate is booking systems. As we know, like tripadvisor and bookings, which all of them are popular booking system. when we enter the destination, o...