TAG

A tag is a (relevant) keyword or term associated with or assigned to a piece of information (like picture, article, or video clip), thus describing the item and enabling keyword-based classification of information it is applied to.

Tags are usually chosen informally and personally by the author/creator or the consumer of the item — i.e. not usually as part of some formally defined classification scheme. Tags are typically used in dynamic, flexible, automatically generated internet taxonomies for online resources such as computer files, web pages, digital images, and internet bookmarks. For this reason, "tagging" has become associated with the Web 2.0 buzz.


Many people associate "tagging" with the idea of the semantic web, however some believe that tagging may not be having a positive effect on the overall drive towards the semantic web.
Typically, an item will have one or more tags associated with it.