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A uniform resource locator (URL), colloquially known as an address on the Web, [1] is a reference to a resource that specifies its location on a computer network and a mechanism for retrieving it. A URL is a specific type of Uniform Resource Identifier (URI), [ 2 ] [ 3 ] although many people use the two terms interchangeably.
URL is a useful but informal concept: a URL is a type of URI that identifies a resource via a representation of its primary access mechanism (e.g., its network "location"), rather than by some other attributes it may have. [19] As such, a URL is simply a URI that happens to point to a resource over a network.
Like all pages on the World Wide Web, the pages delivered by Wikimedia's servers have URLs to identify them. These are the addresses that appear in your browser's address bar when you view a page.
When a URL or domain name is given, putting both a plain-English title or description and the URL is often more informative: for example, European Space Agency website, www.esa.int. If the URL or domain name is displayed, make it as simple as possible; for example, if the index.html is superfluous, remove it (but be sure to check in preview ...
MediaWiki does not attempt to detect any part of the URL to create a link, such as www, which many websites do not use in the URL. The standard Wikipedia skin, Vector, shows only PDF icons, as does Cologne Blue. Modern, MonoBook and Timeless show a full set of filename extensions icons and some URI scheme icons; Minerva (mobile) shows
PURLs allow third party control over both URL resolution and resource metadata provision. A URL is simply an address of a resource on the World Wide Web. A Persistent URL is an address on the World Wide Web that causes a redirection to another Web resource. If a Web resource changes location (and hence URL), a PURL pointing to it can be updated.
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Numeric character references (e.g. [ or [) should not be used in external links because the ampersand character (&) has a special meaning in a URL. In excessive cases, an automatic percent encoder such as the one at W3 Schools (use the second JavaScript form under "URL Encoding Functions") is probably the simplest solution.