Selenium is a tool primarily used for automating web browsers, which makes it great for testing web applications’ user interfaces. However, it is not designed for API testing. APIs (Application Programming Interfaces) provide a way for different software applications to communicate with each other, and their testing usually involves sending requests to URLs and validating the responses, which is outside Selenium’s scope.

For API testing, you would typically use other tools and libraries. Here are some commonly used tools for API testing:

1. Postman:

   • A popular application for testing APIs. Postman allows you to create and send HTTP requests to APIs and view responses. It also provides features like saved collections of requests, environment variables, and integration with CI/CD pipelines.

2. Rest-Assured:

   • A Java library for testing RESTful APIs. It’s often used in automated test frameworks and integrates well with Java-based tools like JUnit and TestNG.

3. SoapUI:

   • An open-source web service testing application for SOAP and REST APIs. SoapUI allows you to create complex requests, run them against web services, and validate responses.

4. HttpClient (Java), Requests (Python):

   • Programming languages like Java and Python have their own libraries for making HTTP requests, which can be used for simple API testing.

5. Curl:

   • A command-line tool used for transferring data with URLs. Curl can be used to quickly test APIs from the command line.

6. JMeter:

   • Primarily a performance testing tool, JMeter can also be used for functional API testing. It’s useful for testing APIs under load.

7. Insomnia:

   • Another simple yet powerful tool for API exploration and testing, similar to Postman but with a different user interface and features.