Rise in Selenium Testing. What makes it so good?

Selenium is a widely used automation testing tool that is applied to test the web based apps. It is an open source testing tool that can run easily on several OS and browsers. A user friendly tool, it can be used to run test scripts on any web browser that have been developed by using various programming languages, including, C, Java, C++, Python, Perl, .Net, Ruby, etc. The big question here is why Selenium? Well, one of the primary reasons is it is still one of the finest tools available for testing web applications. Its compatibility to work with multiple operating systems and browsers has increased its demand.