Knowledge transfer refers to transferring an awareness of facts or practical skills from one entity to another. The particular profile of transfer processes activated for a given situation depends on (a) the type of knowledge to be transferred and how it is represented and (b) the processing demands of the transfer task. From this perspective, knowledge transfer in humans encompasses an expertise from different disciplines: psychology, cognitive anthropology, anthropology of knowledge, communication studies and media ecology.

In information systems, a tag is a keyword or 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, although they may also be chosen from a controlled vocabulary.