A "theme" is a collection of files that define the presentation layer or "look and feel" of a Drupal site. With a theme you can: * Define one or more page layouts. * Specify the display of images and other graphical elements * Specify the display of fixed or variable text * Specify the attributes of fonts and graphics * Override (change) the output from modules A theme can be configured to dynamically respond to changes in the content, content types, user input, user role etc. A theme can also be used to override (modify or replace) the text and variables that are generated by modules. For example, a theme can be used to replace the default label on the Search button or to hide and display certain fields that are part of a particular content type. You can also override the default CSS classes that might appear in your content. Often a theme is used simply to define the look and feel of an entire site, but it can also be used to cust