A Uniform Resource Identifier (URI) is a generic term for the names of all resources connected to the World Wide Web.
URIs enable the protocols over the internet to conduct the interactions between and among resources. URIs take the form of strings of characters that server as identifiers: names and addresses to connected devices and other resources. The most common form URI is the Uniform Resource Locator (URL) — aka web address — which unambiguously describes and locates a public website or other web-connected resource.
“The most common URI, or naming protocol for places and objects on the internet, is the URL. Website URLs contain information on the online service and its location. Just be sure that the certs are valid so you aren’t visiting an artfully spoofed site that just records your activity and data.”