Selenium is a widely used and popular test automation framework for web applications, known for its flexibility, scalability, and vendor-agnostic approach. With over twenty years of growth and development, Selenium has expanded from a single browser execution technology to a full suite of products that combine to create something much more powerful. Its open-source nature makes it accessible to a wide range of users, and various frameworks have been developed on top of the core Selenium project. Selenium's WebDriver technology allows for interaction with browsers as if they were human, enabling a range of testing scenarios, including functional test automation, compatibility testing, visual testing, and performance/load testing. The framework provides a robust infrastructure to organize and manage tests, report statistics, and integrate with Continuous Integration and Continuous Delivery systems. With its popularity and widespread adoption, Selenium is often the tool of choice for web application testing, offering a range of benefits, including ease of use, flexibility, and scalability.