Where is the difference between locating and identifying a resource?

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What's the difference between a URI and a URL?

Is there any difference? I'm talking about URI for identifying, but URL for locating. Aren't both the same thing?

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They can look the same, but they're not the same thing. A URL identifies something that can be transferred over some protocol (often http). A URI, can be used to identify a namespace (for example) but there might not be any content at the address.

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Where is the difference between locating a ressource and identifying a ressource?

Knowing who I am doesn't tell you anything about where I am.

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A URI identifies a resource either by location, or a name, or both. More often than not, most of us use URIs that defines a location to a resource.

A URL is a specialization of URI that defines the network location of a specific resource.

Generally, if the URL describes both the location and name of a resource, the term to use is URI.

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