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Tag is a keyword or term assigned to a piece of information (such as an internet bookmark, digital image, or computer file). This kind of metadata helps describe an item and allows it to be found again by browsing or searching. Tags are chosen informally and personally by the item's creator or by its viewer, depending on the system.
Advantages:
The flexibility of tagging allows users to classify their collections of items in the ways that they find useful, but the personalized variety of terms can present challenges when searching and browsing.
Websites that include tags often display collections of tags as tag clouds. A user's tags are useful both to them and to the larger community of the website's users.
Tags may be a "bottom-up" type of classification, compared to hierarchies, which are "top-down". In a traditional hierarchical system (taxonomy), the designer sets out a limited number of terms to use for classification, and there is one correct way to classify each item.
Please add Tags to your each and every post. This will help the search engine to keep a find your resource quickly and earn Google revenue in return
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