The grouping of words in the lower left hand sidebar of this site is called a "tag cloud". The cloud shows you all the tags we are using on this site. Tags are a new style of search data that describe what each page or story on the site is about. The tag cloud is therefore a visual map of the content on a site. Tags that are large and bold are written about a lot, tags that are smaller have only been written about a few times. Click on a tag and you get a search page showing you all tbe content on that topic.