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(computer science)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)


(Uniform Resource Locator) The address that defines the route to a file on an Internet server (Web server, mail server, etc.). URLs are typed into a Web browser to access Web pages and files, and URLs are embedded within the pages themselves as links (see hypertext).

The URL contains the protocol prefix, port number, domain name, subdirectory names and file name. If a port number is not stated in the address, port 80 is used as the default for Web traffic (HTTP traffic). See port 80 and TCP/IP port.

Downloading the Home Page
To access a home page on a website, only the protocol and domain name are required. For example, http://www.computerlanguage.com retrieves the home page of the Computer Language Company's website. HTTP is the Web protocol, and WWW.COMPUTERLANGUAGE.COM is the domain name. Browsers default to the http:// prefix so only the www.computerlanguage.com needs to be typed in. In fact, you can usually omit the WWW and dot, because most websites treat blank hostnames as "www" hostnames. Sometimes, you can even omit the .com, and the browser fills it in automatically.

Another Web Page
If a page is not the home page, its name has to be part of the address, and a slash is used to separate it from the domain name. For example http://www.computerlanguage.com/about.htm points to the About page (about.htm file). See URL shortening.

The Full Path
If a page is stored in a subdirectory (folder within a folder), its name is also separated by a slash, and subdirectories can be several levels deep. Follow the example below:
Hypothetical URL:


 This:          Is the:

 http://        protocol

 www.car.com/   domain

 kia/           subdirectory

 used/          subdirectory

 2008.html      file (Web page)

Is It a URL or a URI?

Technically, a URL is a type of uniform resource identifier (URI). Since most URIs are URLs, "URL" is the term more commonly heard. See URI.
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References in periodicals archive ?
The check-through facility will enable incoming passengers to proceed straight from their plane to the ERL and allow them to pick up their baggage and clear customs at KLCAT.
ERL laboratories hold the newest pilot-scale equipment: hydrocracking plants; hydrotreaters; stirred tank reactors; gamma ray densitometers; atmospheric and vacuum distillation capability; fluidized bed combustors; a tunnel furnace; coke ovens.
ERL received its first Transit train from China in October 2016 and the first Ekspres train was delivered to Malaysia in 2017.
"ERL will continue to run Edinburgh Rugby and intends to fulfil all of its playing and contractual commitments.
But although the RFU contingent on ERL believe Rotherham's promotion should be ratified immediately, the five-strong Premier Rugby group have requested more information.
The ERL is expected to operate around the clock from KL Sentral.
The ratings reflect ERL's strong risk-adjusted capitalisation, good projected financial performance and adequate enterprise risk management.
Erl is an author, editor and consultant on service-oriented architectures, and he has designed this comprehensive reference volume on SOA design patterns for organizations that need to build and deliver high-quality software applications.