There are 2 services you need for a functioning web site - a domain and a web hosting plan for it. Each time you type the domain name in your web browser, you see the content that’s uploaded inside the hosting account, but if that domain isn't linked to such an account or to an email service, it's parked. Put simply, the domain address is registered and you are its owner, but it does not have any content of its own. Instead, it can open either a pre-made “Under Construction / For Sale” Internet page from the registrar company, or it could be forwarded to some other URL of your choice. The advantage of parking a domain address is that you can keep it and ensure that nobody else is going to take it. In the meantime, it won't occupy 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 such as .net, .org or country-code ones to forward them to the main web site so as to protect a brand name.