A tag cloud is a visual representation of tags used within the content
of a website. Tags are relevant keywords assigned to a piece of
information on a site, and a tag cloud shows the frequency with which
that particular tag appears. It enables users to view all items on the
website that contain that tag by clicking on the word in the tag cloud.
Commonly, the more times a tag appears within the content of a website,
the larger the word appears within the tag cloud.