API Testing is the process of verifying that an Application Programming Interface (API) functions as intended. It involves checking the API's responses to various requests, ensuring that it returns the correct data and behaves as expected under different conditions. This type of testing helps identify issues early in the development process, improving the overall quality of the software. During API Testing, testers evaluate aspects such as performance, security, and reliability. They use various tools and techniques to simulate different scenarios, ensuring that the API can handle expected loads and respond accurately. Effective API testing is crucial for seamless integration between different software components.