URL

URL (Uniform Resource Locator, previously Universal Resource Locator) - pronounced
YU-AHR-EHL or, in some quarters, UHRL -  is the address of a file (resource)
accessible on the Internet. The type of file or resource depends on the Internet
application protocol. Using the World Wide Web's protocol, the Hypertext Transfer
Protocol (HTTP), the resource can be an HTML page (like the one you're reading), an
image file, or any other file supported by HTTP. The URL contains the name of the
protocol required to access the resource, a  domain name that identifies a specific
computer on the Internet, and a path name (hierarchical description of a file location) on
the computer.
On the Web (which uses the Hypertext Transfer Protocol), an example of a URL is:
       http://www.ietf.org/rfc/rfc2396.txt
Which describes a Web page to be accessed with an HTTP (Web browser) application
that is located on a computer named WWW.ietf.org. The path name for the specific file in
that computer is /rfc/rfc2396.txt.
An HTTP URL can be for any Web page, not just a home page, or any individual file.
Examples:
http://dawn.com
http://www.vu.edu.pk
http://www.smeda.org.pk