What is the difference between a parked domain and an add-on domain?
A parked domain is an additional domain that points to main directory of your account. You can park an unlimited number of domains at no cost. A parked domain will resolve to your primary domain name.
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Say your primary is abc.com and you park xyz.com
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In the address bar if you type xyz.com it will resolve to abc.com but in the address bar you will see xyz.com.
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An add on domain allows you to run a separate web site to your primary domain. When you create an add on domain, it makes a folder in your public_html folder and you upload the site content into that folder. So essentially you are running 2 separate sites, separate content, off one account.
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Say your primary is abc.com and you create addon domain xyz.com. The addon domain is pointed to the xyz folder under public_html.
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In the address bar if you type xyz.com it will resolve to the content in the xyz folder and in the address bar you will see xyz.com.
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With both the parked and add-on domains, you can create seperate email accounts for each domain name.