Thank you for your question. Yes, a subdomain is like a separate domain name. Here is a link to an article here in our support center that covers Subdomain, Addon, and Parked domains.
Also here are links to our walk-through articles on installing Joomla, and installing a template.
If you have any further questions, feel free to post them below, or contact live Tech Support.
They are available 24/7 via:
Phone: 877-595-4482 x2
Chat (there is a link on the top right).
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