One popular open-source tool for automated testing is Selenium, which helps testers automate web applications across different browsers and platforms. It works with a number of programming languages, including Python, Java, and C#, making it flexible across various development environments. Selenium improves testing efficiency, reduces manual effort, and ensures faster release cycles by enabling automated regression and functional testing. By enrolling in a Selenium Course in Chennai at FITA Academy, learners can gain hands-on experience in automation frameworks and real-time projects and help them build strong careers in software testing and quality assurance.