a web address suffix.
The ".at" suffix in a web address is the country code top-level domain (ccTLD) for Austria. Websites using this suffix are typically associated with entities or individuals based in Austria.
Australia.
If a site has the suffix .edu then it is most likely is an education website.
hypertext trasfer protocol
The web address of the Northern Ca Veterans Museum is: http://www.norcalveteransmuseum.org
The web address of the African-American Museum-Ca is: http://www.caamuseum.org
The suffix depends on what use you want to make of the web site. Normally, .com and .biz are reserved for business, .edu for education, .net for organizations having to do with the actual network, .mil for the military, .gov for government, and .org for other organizations. Recently, .mob has been added for sites intended for mobile applications, .tel for contact information centric sites, and .xxx for pornography. Additionally, there are country-specific domains, .us, for instance, or .ca for Canada, and similarly for every country there is a two-letter domain suffix.
dot ru = Russia. The TLD (top level domain) for the country of Russia is ".ru"
WWW is an identifier, it is the HTTP suffix, and the address prefix.
.ca means it is a Canadian domain name or web site
I thinik it means Canadian