What are tags?
Tags are a useful way to search for threads with similar subject matter and content. This complements the normal search system, which searches only for certain words or phrases and/or posts by specific users.
To use tags, you add words or phrases to threads to help describe the content. For instance, if the subject matter is 'photography' then you can add the tag 'photography' to the tag list. But you could also add tags like 'digital image', and 'camera' (depending, of course, on the nature of the thread).

This will categorize this thread with all other threads that have matching tags, whether or not they have the word 'photography' in them.

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How do I use tags?
Tags are displayed in a box near the bottom of a thread page. Clicking on a tag will allow you to view other threads that have the same tag - and which may be related. Clicking on the word 'Tags' in the top of the box will take you to an overview page with a 'tag cloud.'
This cloud allows you to see which tags are the most popular - the larger the word, the more times it has been used on threads within the board. There is also another tag cloud on the advanced search page that shows you the tags that have been searched for (or clicked on) the most.