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URI, URN, URL
A Uniform Resource Identifier (URI) is a string of characters used to identify a name or a resource on the Internet
A URI can be a URL or a URN
A Uniform Resource Name (URN) defines an item's identity
the URN urn:isbn:0-395-36341-1 is a URI that specifies the identifier system, i.e. International Standard Book Number (ISBN), as well as the unique reference within that system and allows one to talk about a book, but doesn't suggest where and how to obtain an actual copy of it
A Uniform Resource Locator (URL) provides a method for finding it
the URL http://www.sti-innsbruck.at/ identifies a resource (STI's home page) and implies that a representation of that resource (such as the home page's current HTML code, as encoded characters) is obtainable via HTTP from a network host named www.sti-innsbruck.at