What is API testing, and how is it automated?

API testing focuses on evaluating the functionality, reliability, performance, and security of application programming interfaces (APIs). This type of testing aims to ensure that APIs function as expected and that they correctly handle data exchange between systems. Automated API testing often utilizes tools like Postman, which streamline the process of creating, running, and managing test cases.

Automation is particularly beneficial in API testing because it allows for repetitive tests to be executed quickly and consistently. Automated tests can efficiently cover a variety of scenarios, including positive and negative test cases, performance testing under load, and security validations, without the burden of manual testing effort. This helps surface issues early in the development cycle and supports integration processes effectively.

The other options do not align with the primary focus or practices of API testing. Checking the graphical user interface is relevant to user interface testing, while verifying the security of databases pertains more to database security testing. Claiming that API testing is not suitable for automation overlooks the significant advantages and techniques available in modern software development practices.