What is the difference between addon domains and ‘alias’ domains?

Addon and alias domains

Characteristic	Addon domains	Alias domains
The main domain appears in the address bar.	Yes	No
The domain uses the following Apache directive:	VirtualHost	ServerAlias
The domain uses separate logs.	Yes	No
The domain uses separate stats.	Yes	No
The system treats the domain as a subdomain (other than the URL).	Yes	No
This type of domain is ideal for multiple domains that share the same address.	No	Yes