Selenium is powerful open-source automation testing tool which is used for automating web-based applications. Selenium IDE is an easy to use tool for any person and which is designed to work with Firefox. It uses Firefox plugin with graphical user interface, this GUI will allow user to record test actions and replay. It also supports to write/run test cases without learning scripting languages as well as to all common languages such as Java, C#, Perl, Python, Ruby and Groovy scripts.