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A Uniform Resource Locator (URL) is a Uniform Resource Identifier which, “in addition to identifying a resource, [provides] a means of locating the resource by describing its primary access mechanism (e.g., its network ‘location’).� People often call an Internet domain name a “URL�. People sometimes call the concatenation of an Internet domain name and a URI path a “URL�. Neither construct is a URI and so neither construct is a URL. However, there is a widely-deployed body of software that accepts these constructs in place of URIs, translating the constructs to URIs using context, heuristics, or both. For example, widespread Web browsers accept the text “www.example.com� as user input in an address field, inferring the scheme and yielding “http://www.example.com�.
Source: Wikipedia
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