A uniform resource locator, abbreviated url, also known as web address, is a specific character string that constitutes a reference to a resource. in most web browsers, the url of a web page is displayed on top inside an address bar. an example of a typical url would be "http://en. example. org/wiki/main_page". a url is technically a type of uniform resource identifier (uri), but in many technical documents and verbal discussions, url is often used as a synonym for uri.