A lot of people don’t understand (or don’t care) why some domains start with www and why some domains do not. Well let me shed some light on the matter.
Technically speaking www.example.com is just a subdomain of example.com, which is the ‘root’ domain. Just like mail.google.com is a subdomain of google.com. www.example.com, in theory, could have totally different content to example.com (just as mail.google.com has different content to google.com). However in the vast majority of cases they both show the same content, because lots of people assume the www is optional. So why the www? Well according to Wikipedia it was accidental. Read More
