URIs and URLs
URI, URL

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What is the difference?

A URI is a Unique/Uniform Resource Identifier. It could be compared to a Name (identifier). It is "a compact sequence of characters that identify an abstract or physical resource." Sometimes people even refer to it as a URN.

A URL is a Unique/Uniform Resource Locator. It is the item's name AND its location. It is a "subset" of URIs that, in addition to giving the resource a name/identity, also provide a way to locate it. 

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