said 1 year, 3 months ago:
Subdomains are the third level domains that are used to organize your web site content.
They are just like folders under your root directory. But they will have a special URL to access.
http://www.yoursite.com is the regular URL with out a subdomain.
http://products.yoursite.com is an URL with subdomain “products”.
.com is the first level domain
yoursite is the second level domain
products is the third level domain
An add-on domain is just like having a separate web site.
[ consider your addon domain name as addondomain.com ]
There are 3 ways of accessing an addon domain:
Accessing the addondomain.com will display that very domain name in the address bar of their browser, so its similar to a separate web site.