Category
The word Category is actually a programming code/instruction that the software understands that generates this wiki: when you put somewhere in your text between double square brackets e.g.
Category:Budget
, it remains invisible in the "page view" but the software that generates this wiki will then automatically take up a link to your page in a page, listing all the pages that hold that code, so authors working on this topic can easily find and link-up with each other. Go ahead and at the bottem of this page, just click any of these links in the blue which will take you to such an automatically generated page with a list of links to all pages where that code has been inserted.
More examples of such categories and remember there all between double brackets normally, so another pair of these in front of the letter C:
Category:Countries/lang-fr]] Category:Countries|fr]] Category:Countries|Guinea]] Category:Corruption]] Category:Budget]] Category:Guinea]]
Just click the edit button on a well developed page and you'll see that "Category:something".