content of wiki

Overviews

An overview surveys what is covered in an area.
Overview – outline that surveys key articles in Wikipedia, divided into 12 major branches
List of academic disciplines – outline of knowledge divided by field of study
Outlines – subject overviews as structured lists that identify the subjects' topics and show how they are related to each other.
Lists

Wikipedia has thousands more topic lists; some even are lists of other lists.
Lists – of related articles · Category:Lists
Two of the broadest list collections are:
Lists of countries and territories and many lists by country
Lists of people including by nationality and by occupation
Alphabetical indexes
Alphabetical indexes are the exceptions to the topical section rule.
Portal:Contents/Indexes – Indexes of articles, by subject, alphabetized.
Complete alphabetical index – pages sorted by the first two letters of the title, e.g., "Aa Ab Ac Ad..."
Special:Categories – every category listed alphabetically
Outlines
Outlines are subject overviews in structured lists that show how topics are related to each other.
Outlines · Category:Outlines
Timelines
Timelines list articles chronologically. The top-level timelines and timeline sets are:
List of timelines – historical timelines, arranged by subject. Find more in Category:Timelines
List of centuries – (e.g., 20th century)
List of decades – (e.g., 1910s)
List of historical anniversaries – (e.g., today)
2012 – major events this year
Portal:Current events – featured current events and related project activities
Recent deaths – lists notable people who died not long ago
Category:Graphical timelines – graphical timelines in the category and subcategories, arranged alphabetically
Featured content

Featured content is the best Wikipedia has to offer, via vigorous peer review. Presented by type:
Featured articles · Featured lists · Featured pictures · Featured portals · Featured sounds · Featured topics
Spoken articles

Growing collections of Wikipedia articles are available as spoken word recordings.
Spoken articles · Category:Spoken articles
Wikipedia books

Wikipedia books are collections of Wikipedia articles that can be viewed, downloaded, or printed into a book.
Category:Wikipedia books (community books) – alphabetical list of the books
Category:Wikipedia books – categorized by topic
Portals

A portal introduces the reader to a subject by presenting images, categories and excerpts of key articles. Portals also guide editing by providing to-do lists.
Portals · Category:Portals
Categorical indexes

Wikipedia's category system is generated from category tags at the bottom of articles and other pages. The top-level pages are:
Categories – an index of major categories, arranged by subject (because this page is crafted by hand, it is an exception to the category autogeneration rule)
Category:Articles – the category in which all article category systems are located
Category:Categories – pages and categories which themselves specifically relate to categories
Category:Contents – the highest level or "root" category in Wikipedia – its subcategories contain various types of encyclopedic content, content that assists with the navigation of the encyclopedia, as well as pages related to the maintenance of the encyclopedia – its autogenerated entries are listed at the bottom of the page
Category:Fundamental categories – the category containing the most fundamental ontological categories, such that every article category system can reasonably be expected to be within it
Wikipedia's other broad categorical indices are:
List of Dewey Decimal classes – top two levels of this library classification system, linked to Wikipedia articles
Library of Congress Classification – LCC subjects linked to Wikipedia articles
Outline of Roget's Thesaurus – articles organised into a system based on six classes, with thousands of branches, following Roget's system
Glossaries

Glossaries are lists of terms with definitions.