Pronounced "earls". The AddressSystem used by the Internet to locate resources such as web sites. An URL includes the type of resource being accessed such as Gopher or hypertext), the address of the server, and the location of the file. For example, the complete URL for the PHTN Web site is . "http://" indicates the access method as Hyper text Transfer Protocol. "www.cdc.gov" is the address of the server. "/phtn/" specifies the directory the File is located. "index.aspl" is the initial page of the PHTN Web site. Web browsers will assume "http://" and "index.aspl", SO you can simply use as the URL.