URI stands for Uniform Resource Identifier. A URI is a string of characters used to identify a resource on the internet. It can represent resources such as web pages, images, or files and allows them to be located or interacted with over the web.
URIs come in two main forms: URLs (Uniform Resource Locators), which provide a specific address or location for accessing a resource, and URNs (Uniform Resource Names), which give a resource a unique name without specifying a location. A URL is the most common type of URI, like https://www.example.com/page, where it describes both the protocol (https://) and the location (www.example.com/page).