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What is the difference between URI,URL and URN

 
Greenhorn
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Please tell me the Difference between URI,URL and URN

thanks in advance..
 
Greenhorn
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URI: is a string that identifies any resource. Identifying the resource does not necessarily mean we can retrieve it. URI is a superset of URL and URN

URL: URI that specify a common Internet protocol such as HTTP or FTP are also called URLs. URL is an informal term an is not used in technical specifications.

URN: A URN is an identifier the uniquely identifies a resource but does not specify how to access that resource.
 
Ranch Hand
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Adding to Rupal's answer.

URI: Uniform Resource Identifier. This string identifies any resource by naming it. You may or may not be able to access this resource.

URL: Uniform Resource Locator. The physical address of any resource. Just like a person's street address is used for locating him, URL gives you the web address of a document online.

URN: Uniform Resource Name. Simply the name of any resource. No information about how/where to access the resource.
 
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