The Selenium framework itself is a set of different tools, but the most popular and the most useful to new and experienced testers alike is WebDriver. It's a free and open-source tool that allows you to interact with a website for web automation testing, supporting popular programming languages like C#, Java, JavaScript, Python, Ruby, and PHP. The test project can be integrated with the existing solution by using the same language as the development team, which improves collaboration and reduces bugs. Selenium is preferred over other frameworks due to its flexibility and ease of use. By the end of this tutorial, you'll be able to write automated tests that work seamlessly on local and cloud Selenium Grid.