Selenium is a widely-used open-source framework for automating web browsers, allowing testers and developers to script and validate web application behavior across browsers like Chrome, Firefox, and Edge. It supports multiple languages including Java, Python, and C#, and comprises key components such as WebDriver, IDE, and Grid for parallel testing. Selenium integrates seamlessly with tools like TestNG and Jenkins for CI/CD workflows. As automation testing demand grows, taking a Selenium Course in Chennai at FITA Academy equips professionals with practical skills, real-world project exposure, and strong career opportunities in QA automation.