Help:Namespaces
Pages without a ':' in their name are in the main namespace. These are typically the bulk of the content pages in a wiki. Pages which aren't directly related to this core content, may go in other namespaces. These pages have a name of the form "namespace:page", for example this page is called "Help:Namespaces" (this page belongs to the namespace 'Help' and the name of this page is 'Namespaces').
