URI vs URN vs URL

Do you know what does URI, URL and URN means? I bet you will say that I know about URL but what about URI and URN! Here is a good description on Wikipedia and that is enough to understand these three:

URI tells a unique path to a resource on the Internet. This image will give you some understanding of the relationship of URI, URL and URN.

URI vs URL vs URN

URI vs URL vs URN

Img from Wikipedia

Now, wikipedia has a very good explanation for this and I cannot give you better explanation:

Computer scientists may classify a URI as a locator (URL), or a name (URN), or both. A Uniform Resource Name (URN) functions like a person's name, while a Uniform Resource Locator (URL) resembles that person's street address. In other words: the URN defines an item's identity, while the URL provides a method for finding it.

The ISBN system for uniquely identifying books provides a typical example of the use of URNs. ISBN 0486275574 (urn:isbn:0-486-27557-4) cites unambiguously a specific edition of Shakespeare's play Romeo and Juliet. In order to gain access to this object and read the book, one would need its location: a URL address. A typical URL for this book on a Unix-like operating system would be a file path such as file:///home/username/RomeoAndJuliet.pdf, identifying the electronic book saved in a file on a local hard disk. So URNs and URLs have complementary purposes.

For more on "URI vs URN vs URL" head to:
http://en.wikipedia.org/wiki/Uniform_Resource_Identifier

  • # 1 - by Only4myKids

    only know about URL.. great info.. thanks

  • # 2 - by Only4myKids

    only know about URL.. great info.. thanks

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