reddit

“URI stands for Uniform Resource Identifier, and it's the official name for
those things you see all the time on the Web that begin 'http:' or
'mailto:', for example http://www.w3.org/, which is the URI
for the home page of the World Wide Web consortium. (These things were called
URLs, for Uniform Resource Locators, in the early days of the Web, and the
change from URL to URI is either hugely significant or completely irrelevant,
depending on who's talking—I won't have anything to say about this issue
here. If you've never heard of URIs (or IRIs, the even more recent fully
internationalised version), but are familiar with URLs, just think 'URL'
whenever you see 'URI' below.)” source...