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Vagrant Drupal Development (VDD) is fully configured and ready to use development environment built on Linux (Ubuntu 12) with Vagrant, VirtualBox and Chef Solo provisioner. VDD is virtualized environment, so your base system will not be changed and remain clean after installation. You can create and delete as many environments as you wish without any consequences.
You can configure your own development VM's using Vagrant. Many people use it to customise their development desktops and servers according to the requirements of the software they are developing e.g. the PHP version or PHP settings it requires to work properly. VDD takes automation a stage further by providing an out-of-the-box VM that has been configured intelligently and contains a carefully selected set of installed and configured tools specifically for Drupal development However, the VDD is in fact a starting point and you can build your own variants from it.