This chapter introduces Vagrant, the tool you want to master. We start with a short description of Vagrant: its role and why you should learn it in the first place. To fully appreciate its benefits, we will analyze the current approaches to set up a development environment for a web application. After summarizing the problems with traditional methods, we will discuss how virtualization can help resolve various issues. With a clear image of the virtual approach, we will demonstrate the simplicity offered by Vagrant. Then we will proceed with the installation of the software; finally, you will take a look at the built-in manual and the Vagrant documentation. The pros of using Vagrant that you will learn here should convince you to give Vagrant a try.