This document discusses using Vagrant for Drupal development. Vagrant allows developers to run identical development environments across different computers using VirtualBox and Vagrant to provision virtual machines. This solves issues like code working on a developer's local machine but not production, having different PHP versions across machines, and the time needed to set up environments for remote developers. Vagrant uses JSON configuration files to define virtual machines that are then automatically configured using Chef recipes to provide a standardized, reproducible Drupal development environment on any computer.