n information systems, a tag is a keyword or term assigned to a piece of information (such as an Internet bookmark, multimedia, database record, or computer file). This kind of metadata helps describe an item and allows it to be found again by browsing or searching.[1] Tags are generally chosen informally and personally by the item's creator or by its viewer, depending on the system, although they may also be chosen from a controlled vocabulary.[2]: 68
Tagging was popularized by websites associated with Web 2.0 and is an important feature of many Web 2.0 services.[2][3] It is now also part of other database systems, desktop applications, and operating systems.[4]
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