Every Post in WordPress is filed under one or more Categories. Categories allow the classification of your Posts into groups and subgroups, thereby aiding viewers in the navigation and use of your site.

Each Category may be assigned to a Category Parent so that you may set up a hierarchy within the category structure. Using automobiles as an example, a hierarchy might be Car->Ford->Mustang. In creating categories, recognize that each category name must be unique, regardles of hierarchy.

When using the WordPress Default Theme (sometimes called Kubrick, this is one of the two themes delivered with WordPress), Categories are shown in two different places on your blog First, the Categories are listed as links in the Category section of your sidebar, and second, all the Categories to which a given post belongs are displayed under that post. When someone viewing your blog clicks on one of those Category links, a archive page with all the Posts belonging to that Category will be displayed.

The Posts Categories SubPanel allows you to add, edit, and delete Categories, as well as organize your categories hierarchically. Multiple Categories can be selected for deletion. A search option allows you to find the Categories you want to edit or delete. Also remember Categories can be added in the Posts Add New SubPanel.