Theme Concept

A theme is a preset package containing graphical appearance details, used to customize the look and feel of (typically) an operating system, widget set or window manager. Graphics themes for individual applications are often referred to as skins, and the words are often used equivalently, the primary difference being one of scope.

In the case of the OSF portal based on Drupal, a theme contains both a skin plus some pre-configured templates and menu design options. The theme is the embracing, umbrella design context for the OSF installation.