When editing a security domain, you may specify

—    the code: it must be unique

—    the name of the security domain

—    the domain class: this is used to mark the domain to be evaluated under specific security profiles; the classes depend on the configuration

—    a longer description

The description may include hyperlinks (URLs). To go to the linked page RIGHT-CLICK, then

 

A domain may be labelled with one or more classes. The set of available classes is determined by configuration. Most classes lack any semantics; it is just a mark to filter domains.