There are two services that you need for a functioning website - a domain name and a hosting plan for it. Any time you type the domain in your Internet browser, you see the content that is uploaded within the hosting account, but if that domain isn't linked to such an account or to an email service, it is parked. To put it differently, the Internet domain is registered and you're 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” Internet page from the registrar company, or it could be directed to any other URL of your choice. The advantage of parking a domain is that you can keep it and make sure that no one else is going to take it. In the meantime, it won't block a slot for a hosted Internet domain inside your account. You may also park domains if you have a .com, for example, and you register domains with other extensions like .net, .org or country-code ones to forward them to the main site as a way to protect a brand name.