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When you set up a hosting account you will usually associate it with a domain name such as www.mycoolsite.com or www.someothername.com (It can be whatever is available). This is done at the time of purchase by either registering a new domain name, transferring a currently owned domain name or by changing the name servers of your curently owned domain to reflect that of the host with whom you will be signing up. In the case that your signing up with us, the name servers should be changed to ns1.savenhost.com and ns2.savenhost.com
Depending on the hosting plan, you may be limited to using ONLY that one domain name and no add-ons or subs. If you can have multiple domains then most likely you will also be able to add not only the add-on domains but sub-domains as well. At Save N Host, all of our plans include the ability to add sub-domain names, however they do not all include the option to add additional domains or (add-on domains). See hosting plans for specific details.
An add-on domain is an entirely separate name and would have to be purchased and registered just as the first was. An example of which would be owning both www.mycoolsite.com and www.myothercoolsite.com. Each site is separate from the other. If they were shopping malls you would have two malls with stores in each.
A sub-domain is like an add-on domain in that they both are kept in separate folders and under the same hosting plan. The difference is that sub-domains are part of the main domain and would not have to be purchased at all, they are simply created and used as you see fit. They are basically the stores in your mall. Each one is a separate store but is part of the mall. Examples would be bluestuff.mycoolsite.com and greenstuff.mycoolsite.com. The downfall to sub-domains is name flexibility and length. Using sub-domains usually creates a very long URL to remember and often doesn't flow with the name of the main site.
Things to remember:
Add-on domains are domains you add to your existing domain account. You can host multiple domains or multiple websites on a single account. The folder structure is like that of sub-domains however the add-on domains get parked on top of the sub-domain. In other words you can call this website by typing a URL such as http://www.maindomain.com where as a true sub-domain is typed as http://www.subdomain.maindomain.com
You can see the sub-domain website of the add-on domain, as main a domain, when you type your add-on domain name in a browser browser the URL never changes as it continues to load the sub-domain in the browser.
Sub-domains are part of the main domain's structure where as add-on domains are consider more or less its own entity.
Apache configuration needs to know what directory to call when someone opens a particular website in the browser and in case of add-on domains, it will load the sub-domain. Your add-on domain is added as an alias for that sub-domain. So it will be called using either main domain format or sub domain format.
Sub Domains can only be called using sub domain format.
IMPORTANT!!!
You can not have a sub-domain and add-on domain with the same name in the same account so be careful when naming your sub-domains as it would over write a folder with the same name during installation.
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