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Uniform Resource Identifier (URI)

the abbreviation for Uniform Resource Identifier.

URIĀ is a unique sequence of characters that identifies a logical or physical resource used by web technologies. URIs may be used to identify anything, including real-world objects, such as people and places, concepts, or information resources such as web pages and books (from Wikipedia). Some URIs provide a means of locating and retrieving information resources on a network (either on the Internet or on another private network, such as a computer filesystem or an Intranet); these are URLs.

Uniform Resource Locator (URL)

the abbreviation for Uniform Resource Locator.

URLs, colloquially termed a web address, is a reference to a web resource that specifies its location on a computer network and a mechanism for retrieving it (Wikipedia). A URL is a specific type of URI, although many people use the two terms interchangeably. URLs occur most commonly to reference web pages (http) but are also used for file transfer (ftp), email (mailto) and many other applications.