A portal is an introductory page for a given topic. It complements the main article of the subject by introducing the reader to key articles, images, and categories that further describe the subject.
An outline is an organized list of topics covered in an area. Each outline shows the structure of its subject and serves as a table of contents to its coverage on Wikipedia.
A Glossary page presents definitions for specialized terms in a subject area. Glossaries contain a small working vocabulary and definitions for important or frequently encountered concepts, usually including idioms or metaphors useful in a subject area.
Categories can be used by readers to find sets of articles on related topics. Categories can also be defined as subcategories of other categories.
Categorical index – an index of major categories, arranged by subject – that section of the page is an exception to the category autogeneration rule, as it is crafted by hand.
Category:Philosophy—the highest level or "root" category for philosophy in Wikipedia – its autogenerated entries are listed at the bottom of the page.
