A Uniform Resource Identifier (URI) is a string of characters that identifies a logical or physical resource used by web technologies[1]. It can be used to identify anything, including real-world objects, concepts, or information resources such as web pages and books. URIs may be used to identify resources on a network, either on the Internet or on another private network, such as a computer filesystem or an Intranet. Some URIs provide a means of locating and retrieving information resources on a network; these are Uniform Resource Locators (URLs). A URL provides the location of the resource, while a URI identifies the resource by name at the specified location or URL. Other URIs provide only a unique name, without a means of locating or retrieving the resource or information about it; these are Uniform Resource Names (URNs) [1].
In the context of web servers, a well-known URI is a Uniform Resource Identifier for URL path prefixes that start with /.well-known/. They are implemented in webservers so that requests to the servers for well-known services or information are available at URLs consistently in well-known locations across servers[2].
In summary, a URI is a string of characters that identifies a resource, and it can be used to identify anything, including web pages and books. A URL is a type of URI that provides the location of the resource, while a URN is a type of URI that identifies the resource by name.
Sources
[1] Uniform Resource Identifier - Wikipedia https://en.wikipedia.org/wiki/Uniform_Resource_Identifier
[2] Well-known URI - Wikipedia https://en.wikipedia.org/wiki/Well-known_URI
[3] URI vs URL: Differences and When to Use Them - Hostinger https://www.hostinger.com/tutorials/uri-vs-url
[4] Virtual Servers - Information Technology Services https://its.uri.edu/services/945d7ea3712be2a964102f409aa16e78d3a393c1a3/
[5] What is a Uniform Resource Identifier (URI)? - TechTarget https://www.techtarget.com/whatis/definition/URI-Uniform-Resource-Identifier
[6] URL vs URI: Key Difference Between Them - Guru99 https://www.guru99.com/url-vs-uri-difference.html
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