There are 2 services you need for a functioning web site - a domain and a website hosting plan for it. Each time you type the domain name in your Internet browser, you see the content that is uploaded inside the hosting account, but if that domain address is not linked to such an account or to an e-mail service, it's parked. In other words, the domain address is registered and you are its owner, but it does not have any content of its own. As a substitute, it can open either a pre-made “Under Construction / For Sale” webpage from the registrar company, or it may be forwarded to any other URL of your choice. The advantage of parking a domain is that you can keep it and ensure that no one else is going to take it. At the same time, it won't occupy a slot for a hosted domain address within your account. You could also park domain names if you have a .com, for example, and you register domains with other extensions such as .net, .org or country-code ones to forward them to the main site so as to protect a brand name.