There are two services that you’ll need for a working site - a domain plus a website hosting plan for it. If you type the domain in your web 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 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” page from the registrar company, or it may be directed to any other URL of your choice. The advantage of parking a domain name is that you can keep it and make certain that nobody else will take it. At the same time, it will not block a slot for a hosted domain name inside your account. You may also park domains if you have a .com, for instance, and you register domains with other extensions such as .net, .org or country-code ones to direct them to the main web site so as to protect a brand name.