One of test automation tools is Selenium. It is widely used around the world as a tool for automating test for web application. In this book we use Selenium WebDriver to perform automatic operation of the browser. As for browser we use both Mozilla Firefox and Google Chrome. Selenium is a very useful tool but it is not an easy tool which lets us use it as soon as we learn it. Practice is necessary but it is not desirable to use the real website running in the internet for practice.