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A **URI** _(Uniform Resource Identifier)_ is a string that refers to a resource.
The most common are {{Glossary("URL","URLs")}}, which identify the resource by giving its location on the Web. {{Glossary("URN","URNs")}}, by contrast, refer to a resource by a name, in a given namespace, such as the ISBN of a book.
## See also
- [URI](https://en.wikipedia.org/wiki/URI) on Wikipedia
- [RFC 3986 on URI](https://datatracker.ietf.org/doc/html/rfc3986)