Types of Web Sites
Learn to recognize top-level domains
The one-second technique for getting to know a web site is to look at the URL (the web address) and focus on the top-level domain. That's the part before the first slash, as shown below:
The six most-popular (and original) top-level domains are:
.com = this site is commercial; the intent is to sell
.org = this site claims to be an organization
.edu = this is a recognized educational site
.gov = this is a site sponsored by a government agency
.net = network - kind of a catchall.
.mil = military
But wait - there's more! Lots more -- here are just a few:
.biz = business
.info = information
.name = name
.pro = professional
.museum = museums
... and more
There are also country-level domains:
http://www.handgunlaw.us/ (.us = United States)
http://www.fitness.cz/ (.cz = Czech Republic)
http://www.tripadvisor.fr/ (.fr = France)
http://www.police.uk/ (.uk = United Kingdom)
See the full List of country codes at Webopedia
Creative combinations
You might even see sites combining domains, creating a top-level domain and a secondary-level domain, like this:
http://www.airwatch.gov.au/