A Uniform Resource Locator (URL) is a Uniform Resource Identifier (URI) that specifies where an identified resource is available and the mechanism for retrieving it.

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There are many classic tech debates, and the question of what to formally call web addresses is one of the most nuanced. The way this normally manifests is someone asks for the “URL” to put into his or her browser, and someone perks up with, "Actually, that’s called a URI, not a URL…"