In the Monobook (default) skin, the type of page is shown in the currently selected tab and non-article pages have a light blue background. In the Classic skin, pages from these namespaces are displayed on a yellow background to distinguish them from pages in the article namespace.
But not all pages in the article namespace are considered to be articles; the most notable exceptions are:
the [[ Main Page]];
* thousands of "[[wikipedia:find or fix a stub|stub]]" pages that may not be considered real articles yet;
* thousands of [[Wikipedia:Disambiguation|disambiguation pages]] which are used to resolve naming conflicts;
* thousands of "[[Wikipedia:redirect|redirect]]" pages which are used to re-route one page to another page;
The automatic definition used by the software at [[Special:Statistics]] is: any page that is in the article namespace, is not a [[Wikipedia:Redirect|redirect page]] and contains at least one wiki link. '''''The statistics software currently has no method of detecting disambiguation pages, however; nor does it disregard Stubs and Stublists (lists templates with little or no content)'''''.
See [[Wikipedia:Naming conventions]] to learn how we title articles and [[Wikipedia:protected pages]] for a list of pages that have been made read-only to non-[[Wikipedia:Administrators|Wikipedia Administrators]].