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A URL (Uniform Resource Locator) is the address of some resource on the Web. A resource is nothing but a page of a site. There are other type of resources than Web pages, but that's the easiest conceptually. A URI is a unique identifier to usually a namespace. Though it looks like a URL but it doesn't have to necessarily locate any resource on the web. URI is a generic term. URL is a type of URI. URI- Uniform Resource Identifier: it's a string and its responsibility is to identify a resource by meta-information. It gives information about only one resource. URL- Uniform Resource Locator: identifies the resource on the net and tells it is obtainable using what protocols.