There are 2 services you need for a functioning web site - a domain and a hosting plan for it. Whenever you type the Internet domain in your web browser, you see the content that is uploaded within the hosting account, but if that domain address isn't linked to such an account or to an email service, it's parked. To put it differently, the domain is registered and you are its owner, but it doesn't have any content of its own. Rather, it can open either a pre-made “Under Construction / For Sale” page from the registrar company, or it could be forwarded to some other URL of your choice. The advantage of parking a domain address is that you can keep it and make certain that no one else is going to take it. Meanwhile, it won't occupy a slot for a hosted Internet domain in your account. You could also park domain names if you have a .com, for instance, and you register domain addresses with other extensions such as .net, .org or country-code ones to forward them to the main site as a way to protect a brand name.