How to Add Tags
According to Wikipedia:
A tag is a (relevant) keyword or term associated with or assigned to a piece of information (a picture, a geographic map, a blog entry, a video clip etc.), thus describing the item and enabling keyword-based classification and search of information.
Tags are used throughout the site for a dynamic, flexible organization of content. They make it easy for players to find the maps and campaigns they want.
(The above image is from SC Map DB, but the idea is the same.)
You can help out by making sure all maps and campaigns are tagged. A full list of currently used tags can be found on the front page.
Some important tags to use are released and work-in-progress. "Released" will let players know that a map/campaign has a playable release available to download. "Work-in-progress" will provide a warning that it may not represent the intended final product.
Suggestion: Please stick to using the existing tags. If you really want to make your own, tag terms should be broad enough to include a number of other maps, so try not to make them highly specific. Avoid duplicate tags: Don't invent your own tag that means nearly the same thing as an existing one.