URI

A URI (Uniform Resource Identifier) is a compact string of characters that identifies an abstract or physical resource.

A Uniform Resource Identifier can be further classified as either a Uniform Resource Locator (URL) or a Uniform Resource Name (URN). The distinction between URL and URN does not matter to the URI class interface. A "URI-reference" is a URI that may have additional information attached in the form of a fragment identifier.

For more information on Perl, see perl.com or perl.org.