Selenium is one of the most renowned open-source test automation frameworks. Selenium allows test automation of web-apps or websites across different browsers & operating systems. Selenium offers compatibility with multiple programming languages such as Java, JavaScript, Python, C#, and more, allowing testers to automate their website testing in any programming language that they are comfortable with. Using the Selenium framework, testers can deliver test cycles faster by automating repeated test cases, making it a big part of a DevOps workflow.