<h2 style="background-color:#cedff2; border-bottom:0px; border: 1px solid #a3b0bf; text-align:center; padding-top:4px;">
</h2> <!-- 3 line spacing of h2 is important for subsection edit links to work correctly, PLEASE DO NOT FIX --></noinclude>
Categories are groups of articles on related topics. At the bottom of an article, you will see a box containing the categories to which that article has been assigned. Simply click any of these categories to go to the corresponding category page. From there you can browse other articles on the same topic, or navigate through the category tree to find other related categories that you may be interested in.
Most categories have a number of other categories listed as '''subcategories'''. These are listed in a special section of the category page, which appears above the list of articles belonging to the category. Click on these subcategories to navigate through the category tree to find more specific groups of articles.
To go directly to the top of the category structure, see [[Portal:Contents/Categorical index]]. To browse all categories alphabetically, go to [[Special:Categories]].
Articles are not usually placed in every category to which they logically belong. In many cases they will not be placed directly into a category if they belong to one of its subcategories. This is because otherwise categories would become too large, and the list of categories on articles too long.
To find the articles you are looking for, it may be necessary to dig down. For example, you won't find [[Oslo]] listed at the category called [[:Category:Cities|Cities]], but if you start from there and click "[[:Category:Cities by country|Cities by country]]", and then "[[:Category:Cities and towns in Norway|Cities and towns in Norway]]", you'll have arrived at the right place. Conversely, if you are at the [[Oslo]] article and you want to find the category of all cities, start by clicking [[:Category:Cities and towns in Norway|Cities and towns in Norway]] and navigate up the tree to its parent categories.
Different parts of Wikipedia use different schemes for organizing articles into categories. The main types of categories used are:
* '''topic categories''' – categories of articles relating to a particular topic, such as [[:Category:Geography]] or [[:Category:Paris]].