Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Acronyms, Wikipedia.


(computer science)



(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.
References in periodicals archive ?
After thorough industry research, it became clear that CYREN offers the most powerful and proactive security-related URL databases in the world," said Huang Chia Hui, business director at TRcore Networks.
Some Google+ users were also reporting that their existing Google Profile custom URLs are still working, so are wondering what might happen to them as the Google+ customer URLs roll out.
This has woken a few people up to the dangers of URL shortening-all those links, now going nowhere-but there's no question that the practice has been hugely useful.
Table 1 shows that the proposed scheme provides both a complete and a robust procedure for handling URL document archiving since all changes are recorded and the scheme involves recording of source documents and not rendered images.
For custom, finite crawls, we have built crawlers that are fully expert guided in the sense that well-defined crawling targets are provided by experts and crawling occurs in a very directed manner, iVia's "Expert Guided Crawler with Drill Down/Drill Out" takes expert-provided individual or multiple URLs and crawls them.
The URL Shortener integrates with multiple analytics systems, including CrownPeak Analytics, WebTrends, Omniture's Site Catalyst or others.
vu Allows People to Create Extremely Short and Easy-to-Remember URLs
SurfControl's Web filtering database of over 20 million URLs supplies users daily updates and real-time intelligence technologies, offering the most accurate, comprehensive and relevant Internet content security available.
New spam definitions detect URLs in email messages that could exploit the vulnerability and blocks them.
c=202961&p=irol-newsArticle &ID=843825&highlight= (Due to the length of this URL, it may be necessary to copy and paste it into your Internet browser's URL address field.
jsp&channelId=-15628 - Due to the length of this URL, it may be necessary to copy and paste this hyperlink into your Internet browser's URL address field.
10/20/98 IEEE Computer Society - John Goodsen - Rapid Incremental Software Delivery Process with UML 7:30PM (Phoenix), URL http://www.