Except in main namespace (=article namespace), where the subpage feature has been disabled in the English Wikipedia, subpages are pages separated with a / (a slash) from their 'parent' page.
Making a new [[link]] that begins with a / (slash) is the common way to start a subpage. The page to which this link points is considered "subordinate" to its host page, and is titled and linked as [[Parentpage/Subpage]]. It is possible to create a subpage of a subpage (or a sub-subpage). At the top of each subpage or sub-subpage, you can find a backlink (aka breadcrumb) to the higher levels of the page.
To get a list of all subpages of a page, use Special:Prefixindex and type the parent page name followed by a slash. For example, for all subpages of User:Example, type User:Example/
in the search box and hit Go: Special:Prefixindex/User:Example/.
The MediaWiki software supports selectively allowing or disallowing the creation of subpages in various namespaces. In namespaces where subpages are supported, you can create a subpage simply by linking to the name of the subpage, prefixed with a slash (e.g. [[/Archive]]). For Wiki, the User, Talk, and Wikipedia namespaces have subpages turned on; the main (article) namespace does not have this feature turned on, as strictly hierarchical organisation of articles is discouraged, and other distinctions are better made by placing pages in other namespaces (e.g. discussions go in "Talk:", and templates in "Template:").
Some topics have a slash in the name — e.g. GNU/Linux naming controversy or OS/2. This is not a problem. If that's what the thing is called, use the slash. In article namespace this doesn't define a subpage.
Subpages were originally used on Wikipedia to differentiate between subjects to create topical hierarchies of articles, but this proved unworkable because articles tend to belong in more than one hierarchy. The present system of disambiguation was adopted instead, and the Wiki: Do not use subpages policy had to be rigorously enforced, as well as retroactively applied. As of mid-2004, the category system supports hierarchical organization while still allowing an article to belong to multiple categories.
Note that older discussions of subpages are generally concerned with articles named as subpages of other articles; this is no longer done.
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