What are the difference between the subdomains, additonal domains, parked domains? What these terms mean?
A subdomain is a part of the main domain, the second level of the domain. On subdomain, you can create the same site as on the main domain. It is often used for creating a unique domain name for company subsidiaries or services.
The additional domain is a domain that links to separate folder. If you want to create a new domain on your hosting account you should create one more folder to which this domain will be connected. The number of a domain can be limited by terms of a plan.
Domain parking - registered domain names on provider DNS-servers, this domain are do not used for its purpose (without websites). Note, you can place an unlimited number of domains on our unlimited hosting plans, so you can place an unlimited number of websites.