Understanding Web Addresses
As visible in the image above our beloved URL is not alone; all URL’s are URI’s but not the other way around.
Some URI’s are URN’s; I know confusing.
URI = Uniform Resource Identifier
URL = Uniform Resource Locator (used to find information)
URN = Uniform Resource Name (used to identify information)
URN’s and URL’s are URI’s and can be used separately or together depending on the task.
As for the everyday URL that we type, in order to access sites like Google Plus, Facebook, and Amazon.
Take the URL for my site as the example:
http:// = this is a browser request to locate network resources via http from the host.
(Use https:// for a secure connection.)
jrswab.com = host
:80 = Optional, after the host you can add a colon followed by a port number to specify the port.
If the user does not input a port the default is 80 for http and 443 for https.
If a user typed in
the browser would request to locate the network resources at jrswab.com/contact/ via port 80.