Wikipedia has the following views: Categories | Outlines | Portals | Overviews | Lists | Glossaries
There are all views for each subject area and all subject areas for each view. Subject areas are collections of articles.
There are also indexes (A-Z index, 3rd party indices, etc.)
Information about Content Style https://en.wikipedia.org/wiki/Wikipedia:Categorization https://en.wikipedia.org/wiki/Wikipedia:FAQ/Categorization https://en.wikipedia.org/wiki/Wikipedia:Categories,_lists,_and_navigation_templates https://en.wikipedia.org/wiki/Wikipedia:What_Wikipedia_is_not https://en.wikipedia.org/wiki/Wikipedia:Writing_better_articles