Selenium WebDriver makes direct calls to the browser using each browser’s native support for automation. It support multiple browsers, operating systems and programming languages. What’s more? It’s FREE, ‘Open Source’ as we call it! Why do you think it’s so popular? 😉 Though Selenium Webdriver is at the epicenter of automated software testing, it is supported by different tools to make Automation Testing easy, effective & efficient – The Automation Galaxy of Selenium Webdriver tools!