All three URI, URL and URN are used
to identify any resource or name in internet but there is subtle difference
between them. URI is super set of both URL and URN. By the way main difference
between URL and URI is protocol to retrieve the resource. URL
always include a network protocol e.g. http, https, ftp etc to
retrieve resource from its location. While URI, in case of URN just uniquely
identifies the resource e.g. ISBN numbers which are
good example of URN is used to identify any book uniquely. In this article we
will briefly see What is URI, URL and URN and then see main difference between URI, URL and URN.
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