Technical:
a category (in a wiki often called namespace) is under normal circumstances known as the first part of the page name - the partial name before the colon (:) in the page name. You will see this page name in the adress bar as the last part of the URL. This is NOT PART of the page title!
A page name without such colon in its name belongs in wikidot.com to the "_default" category.
As an example:
http://community.wikidot.com/glossary:category is the URL of this article.
The category of this page is now "glossary" ,
the page name is "glossary:category" (!)
and the page title is "category" .
Be careful:
http://community.wikidot.com/category would be a complete different URL of a page with (an unvisible) category name "_default" !!
Logical:
with such partial names you can "group" pages in your wiki into logical categories. Think for example of a group of uneditable - readonly - pages for all visitors and another group of pages where some types of visitors ( anonymous, registered wikidot-members or even site-members ) can edit the pages .
Typical (standard) categories in a wikidot.com site are "_default", "admin", "nav", "forum", "system"and "search". You should better never delete them!
To create first time a new category:
A new category is build by creating ( adding) a new page with entering the
category name , a colon(:) and the rest of the page name either:
- as an open link in an article (usual in a wiki) (example of this page: [[[glossary:category]]] ) and after the save of the changed page you need to click on the "open link" to create the new page…
or
- key in this combined page name in the adress bar of your browser at the end of the url after the …wikidot,com/____ - with enter to get the create a new page….
Setup and usage:
If you are an admin of a wiki you can see all used categories in the wiki on the Site manager (this is the admin:manage page in the category "admin" ) - under the "permissions", where you can decide for every category (and all its pages) if the visitors are allowed to edit such pages (= to see the page options buttons) or not.