What does Subdomain / Addon Domain / Parked Domain mean?
In the control panel, you'll find the sections called Addon Domains, Parked Domains and Subdomains. But what do all those different domain types mean?
What is a subdomain?
In general, a subdomain is a domain which is a part of another domain name. So if you have the domain name example.com, then test.example.com would be a subdomain of example.com. And similarly, sub.test.example.com is a subdomain of both example.com and test.example.com.
In your control panel, the Subdomains section allows you to do two things with subdomains.
Firstly, you can use the Subdomains section to create subdomains of domain names which you already have on your account. So if your account already has mysite.epizy.com and mysite.com attached to it, you can create subdomains like sub.mysite.com and sub.mysite.epizy.com.
Secondly, you can add new subdomains for any of the InfinityFree owned domains to your account. So you can add more subdomains like example.epizy.com and example.rf.gd to your account as well.
Regardless of what type of subdomain you create, a new directory will be created in your account with a new htdocs directory so you can upload a different, separate website to the subdomain.
What is an Addon Domain?
If you already have your own domain name like example.com or example.net registered at a separate domain name provider like NameSilo, you can add it to your account using the Addon Domains section. After you've set the nameservers of your domain name to your account's nameservers (you can find the nameserver addresses in your control panel and instructions for how to set those with your domain registrar), you can add the domain through the Addon Domains section.
After you've done so, a new directory will be created in your account with a new htdocs directory so you can upload a different, separate website for the domain name.
What is a Parked Domain?
Similarly to an Addon Domain, you can add your own domain name to your account using the Parked Domains section. However, when doing so, you'll also have to park it on a certain existing domain on your account. When the domain name has been added, it will serve the same website as the domain it has been parked on.
However, note that Parked Domains simply mean that the domains both serve content from the same directory. With a simple HTML website or very basic PHP site, the same website will be shown on both domains. However, when using a more complex script or CMS, the results may differ. For example, Wordpress always redirects visitors to the Installation URL configured in the Wordpress settings, so the parked domains will be redirected to the original domain.
So by default, Parked Domains will show the same website, but the actual results may differ depending on the content you're hosting on the site your domain is parked on.