URI - MDN Web Docs Glossary: Definitions of Web-related terms 编辑

A URI (Uniform Resource Identifier) is a string that refers to a resource. The most common are URLs, which identify the resource by giving its location on the Web. URNs, by contrast, refer to a resource by a name, in a given namespace, such as the ISBN of a book.

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General knowledge

• URI on Wikipedia
• RFC 3986 on URI