There are 2 services that you need for a functioning site - a domain name and a website hosting plan for it. Any time you type the domain name in your browser, you see the content that is uploaded in the web hosting account, but if that domain address is not linked to such an account or to an e-mail service, it's parked. To put it differently, the domain address is registered and you are its owner, but it lacks content of its own. As a substitute, it can open either a pre-made “Under Construction / For Sale” Internet page from the registrar company, or it could be forwarded to any other URL of your choice. The advantage of parking a domain is that you can keep it and make sure that nobody else will take it. In the meantime, it won't occupy a slot for a hosted Internet domain in your account. In addition, you can 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 in order to protect a brand name.