Selenium automates browsers. That's all there is to it! It's up to you what you do with this power. It is primarily used to automate web applications for testing purposes. However, it is not limited to that. Boring web-based administration tasks are also possible (and should) be automated. Selenium WebDriver is a collection language-specific bindings that allows you to drive a browser the way it was intended to be driven. It will allow you to create robust browser-based regression automation suites, tests, scale, and distribute scripts across multiple environments. Selenium WebDriver is a Chrome and Firefox addon that allows you to quickly create bug reproduction scripts or scripts to assist in automated exploratory testing. It will record and playback all interactions with the browser. You can scale by running tests on multiple machines and managing multiple environments from one central point.