We get asked this question all the time. The answer is actually pretty straightforward:
Sub domain
- Lets say your domain is mysite.com.
- You install a Message Board and put in in a directory called mysite.com/board/.
- You can turn the directory board into a sub-domain by adding it as a sub-domain from your Control Panel.
- Now you can access your Message board as either mysite.com/board OR board.mysite.com
Parked Domain
- You have two domains mysite.com and my-other-site.com.
- mysite.com is the domain of your website and you want to add my-other-site.com.
- You want them both to go to the same place. In other words, when someone types either www.mysite.com or www.my-other-site.com they will go to the same page(s) on your website.
Add-On Domains
- You have two domains mysite.com and my-other-site.com.
- You want the two domains to be totally separate/independent websites.