A tag is a non-hierarchical term assigned to a piece of information . This kind of metadata helps describe an item and allows it to be found again by browsing or
searching. Tags are generally chosen informally and personally by the
item's creator or by its viewer, depending on the system.
Social Bookmarking
Social Bookmarking services allow you to save web addresses on the Internet, under a personal account, and tag each page you find with keywords. .
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