A subdomain is a secondary website with its own content and use the same domain of the main website. The subdomain name looks like private.domain.com, help.domain.com ..etc
You can use cPanel to create subdomains and function is free in all 2MHost web hosting packages.
An alias domain is not a separate website. It is just a masked forwarder to the main website of your hosting account, Aliases are commonly used when you need domain.net shows the same content or website of domain.com. We use 2mhosting.com as alias of 2mhost.com!
You can use cPanel to create aliases, function is free in all 2MHost web hosting packages.
An addon domain is a cpanel function that let you host multiple websites each with its own content and email. When we mention how many websites you can host in a single hosting account we mean how many addon domains you are allowed to create in each hosting account.
You can use cPanel to create addon domains, function is including in Personal-x2 packages and above.