These sites allow users to create and manage labels (or "tags") that categorize content using simple keywords. Tagging gained popularity due to the growth of social bookmarking, image sharing, and social networking websites. Computer based search algorithms made the use of such keywords a rapid way of exploring records. People were using textual keywords to classify information and objects long before computers. An analogous example of tags in the physical world is museum object tagging. Tags may take the form of words, images, or other identifying marks. People use tags to aid classification, mark ownership, note boundaries, and indicate online identity. It is now also part of other database systems, desktop applications, and operating systems. Tagging was popularized by websites associated with Web 2.0 and is an important feature of many Web 2.0 services. 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. This kind of metadata helps describe an item and allows it to be found again by browsing or searching.
In 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). A tag cloud with terms related to Web 2.0
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