Digital identifiers are central to information retrieval and management, so they are consequently crucial to the operation of the World Wide Web. In particular, the ability to identify a digital or real-world, physical resource and/or a description of such a resource relies on its unique identification.
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An identifier is a unique expression in a written format either by a code, by numbers or by the combination of both to distinguish variations from one to another among a class of substances, items, or objects. For living organisms and the structural identifications of objects, identifiers could be more complicated. In computer science, Identifiers (IDs) are lexical tokens that name entities. The concept is analogous to that of a "name." Identifiers are used extensively in virtually all information processing systems. Naming entities makes it possible to refer to them, which is essential for any kind of symbolic processing. (Excerpt from Wikipedia article: Identifier)
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