Abbreviated URL. An address for a resource on the Internet.
URLs are used as a linking mechanism between Web pages and as a method for Web browsers to access Web pages.
A URL specifies the protocol to be used to access the resource (such as HTTP or FTP), the name of the server where the resource is located (as in www.sybex.com), the path to that resource (as in /catalog), and the name of the document to open (/index.html).