There are 2 services that you need for a working web site - a domain and a web hosting plan for it. Each time you type the Internet domain in your web browser, you see the content that is uploaded inside the website hosting account, but if that Internet domain is not linked to such an account or to an e-mail service, it is parked. In other words, the domain is registered and you're its owner, but it doesn't have any content of its own. As a substitute, it can open either a pre-made “Under Construction / For Sale” page from the registrar company, or it may be forwarded to any other URL of your choice. The main advantage of parking a domain is that you can keep it and be sure that nobody else is going to take it. At the same time, it's not going to occupy a slot for a hosted domain inside your account. You may also park domain names if you have a .com, for example, and you register domains with other extensions like .net, .org or country-code ones to direct them to the main web site as a way to protect a brand name.