For any project, companies are rapidly inclining towards open source automated testing tools that will enable them to cut down the cost and effort that manual testing involves. Selenium is one such open source automated testing tool for websites. Performance, execution speed, and browser interaction of Selenium is faster than any other automation tool.
The test packages, the modes of Selenium available for unattended execution, and the fact that the test script can be developed in any language that Selenium supports makes Selenium the most desired automation testing tool.
In addition, Selenium supports different operating systems along with support for different programming languages such as Python, Pearl, Ruby, PHP, .NET, C#, and Java; and various browsers, thereby making Selenium the leading automation tool.