Wikipedia:The difference between articles and pages

Articles and pages are widely confused. As explained in every other Teahouse question, they are completely different concepts, although with similar names.

Characteristics of articles
An article:
 * 1) Is always in mainspace,
 * 2) Is expected to be encyclopedic

Characteristics of pages
A page:
 * 1) Can be in any namespace,
 * 2) Improves the encyclopedia,
 * 3) Can be modified by any user, most of the time

Essentially, articles are a subset of pages.