URI:
“A Uniform Resource Identifier (URI), is an Internet protocol element consisting of a short string of characters that conform to a certain syntax. The string comprises a name or address that can be used to refer to a resource. It is a fundamental component of the World Wide Web.”
https://en.wikipedia.org/wiki/Uniform_Resource_Identifier
URL:
“Every URL is a type of Uniform Resource Identifier (URI), or more precisely the set of URLs is a proper subset of URIs. A URI identifies a particular resource while a URL both identifies a resource and indicates how to locate it.”
https://en.wikipedia.org/wiki/URL