Each file and directory on your server is owned by both a user and a group. Different users are often grouped together into user groups. For example, when you add a virtual host to your Freedom server with the vaddvhost command, a user group with the name of the virtual host is created for you automatically. The purpose of such a user group is to allow multiple users to have access to files, directories, or other resources. On the Freedom 400x and above, you can create an arbitrary number of user groups by editing the /etc/group file as the superuser.