Some related Technologies Demystified -- Tagging

Tagging is cataloguing by the author or creator of the content with the keywords selected informally and personally by the author, not according to some formally defined classification scheme. This is a folksonomy.

An item could have more than one tag associated with it. The software then provides links to other items that share those keywords and this could be between web and blog servers.

A tag cloud is a graphical representation of tags and number of uses of each tag for the web count -- showing the frequency of the use of the tag. The size of the font indicates the use of the tag -- the more often used tags are displayed with a larger font.