Modules add a feature to Jamroom. They extend the existing functionality.
Some examples of modules are:
jrBlog - Allows users to add a blog to profiles they control.
jrAudio - Allows users to upload audio files to profiles they control.
jrVideo - Allows users to upload video files to profiles they control.
The uploaded content will then display on that profile.
Modules are either allowed or not allowed on a profile. Only if a module is allowed on a profile can the user use that feature to add content to the profile.
Which Modules are allowed on a Profile are governed by the Quota system.