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URI, URL, what's the difference? TODO: putting out a simple explanation is harder than you think :)
URIs identify and URLs locate. However, locators are also identifiers, so every URL is also a URI, but there are URIs which are not URLs.
A URI can be further classified as a locator, a name, or both. The term "Uniform Resource Locator" (URL) refers to the subset of URIs that, in addition to identifying a resource, provide a means of locating the resource by describing its primary access mechanism (e.g., its network "location").