What is Octopus?
For a clear description of what Octopus is and does, please see the project page on d.o. http://drupal.org/project/octopus
Octopus creates a clear distinction between the server level and the hosting level. All the hosting is done in the octopus layer. While you can do without this layer, it is not recommended. Further, if you have several different people hosting from the same server, each can have their own octopus login and completely separate set of source code (platforms). Octopus also has several other efficiencies that save disk space and add special modules.
See the project page for an updated list of supported platform.
These components are installed but not enabled on default: