Selenium is a powerful open-source framework for web applications across different browsers and platforms. It supports Java, Python, and C#, allowing testers to write flexible, reusable scripts that mimic real user actions. Its main components include Selenium WebDriver, IDE, and Grid, which together enable faster regression testing and parallel execution. Enrolling in Selenium Training in Chennai at FITA Academy can help beginners and working professionals build practical automation skills, understand frameworks, and prepare confidently for in-demand software testing careers.