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(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 ?
What that statistics say is that any given (public) URL shortening service will likely be abused and at some point develop a bad reputation.
It is important, at least for key landing pages, to construct URLs that will survive these transitions.
In case, the character length goes beyond 98 characters, the Origin Chip will not display any URL," the PhishMe duo quoted.
Many URLs provide hints of goals or missions; some reveal disarray in a technical realm or in an entire organization.
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.
You can switch to batch mode if you have a lot of URLs to bundle together.
It's promised to keep the URLs going until the end of this year, but after that it's pretty much it.
Together, the URLs invalidated by a web site due to reorganization, document removal, renaming, or relocation, plus the links to document snapshots are a web site's historical links.
The latter includes a great number of fields of interest to users or collection builders including URL, title, description, broad subject categories, creators, subject--LCSH, subject--LCC, keywords, access, audience level (academic, K-12, or lifelong learner), institutional owner (which collaborator contributed the record if expert in origin), URL checker information, and INFOMINE collection information (mostly for record keeping: who added, who modified, record number, record origin).
If a URL gives you an error message, try cutting the filename from the URL until only the sewer name remains in the location bar.
If the URL has just been announced and you get a blank screen, the site owners probably haven't planned adequately for high traffic and didn't format the site so you can see text before large graphics load.
bans the use of URLs, parlance for universal resource locators, in print liner ads, although advertisers are welcome to include them in display ads.