There are two services you need for a functioning website - a domain plus a hosting plan for it. Each time you type the domain in your web browser, you see the content that’s uploaded in the hosting account, but if that domain is not linked to such an account or to an e-mail service, it is parked. To put it differently, 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” webpage from the registrar company, or it could be directed to any other URL of your choice. The main advantage of parking a domain name is that you can keep it and make certain that nobody else is going to take it. At the same time, it won't take a slot for a hosted domain name in your account. In addition, you can park domain names if you have a .com, for instance, and you register domain names with other extensions like .net, .org or country-code ones to forward them to the main web site as a way to protect a brand name.