There are two separate services that you need for a working site - a domain name and a hosting plan for it. Each time you type the domain in your browser, you see the content that is uploaded in the website hosting account, but if that domain name isn't linked to such an account or to an email service, it is parked. To put it differently, the domain name 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 directed to any other URL of your choice. The main advantage of parking a domain is that you can keep it and make certain that no one else is going to take it. In the meantime, it will not take a slot for a hosted Internet domain inside your account. You could also park domain names if you have a .com, for example, and you register domain addresses with other extensions like .net, .org or country-code ones to forward them to the main site so as to protect a brand name.