A Uniform Resource Locator, or URL (pronounces as "earl" (SAMPA: [@rl]) or spelled out), is a standardized address for some resource (such as a document or image) on the Internet. First created by Tim Berners-Lee for use on the World Wide Web, the currently used forms are detailed by IETF standard RFC 2396 (http://www.ietf.org/rfc/rfc2396.txt) (1998).
The URL was a fundamental innovation in creating the World Wide Web. It combines into one simple address the four basic items of information necessary to find a document anywhere on the Internet:
A typical simple URL can look like:
HTTP URLs can also contain additional elements, like a query string[?] (placed after the path and separated from it by a question mark (?)) containing information from a html form with method=get, or a name tag (placed after the path and separated from it by a sharp mark (#)) giving the location within a hypertext page to display.