<P> In information systems , a tag is a keyword or term assigned to a piece of information ( such as an Internet bookmark , digital image , database record , or computer file ) . 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 , although they may also be chosen from a controlled vocabulary . </P>
what is the role of video metadata on youtube
helps describe an item and allows it to be found again by browsing or searching