There are two separate services you need for a working site - a domain plus a web hosting plan for it. Each time you type the domain address in your web browser, you see the content that is uploaded inside the web hosting account, but if that Internet domain is not 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 lacks 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 can be directed to any other URL of your choice. The main advantage of parking a domain address is that you can keep it and make certain that nobody else is going to take it. In the meantime, it's not going to block a slot for a hosted domain address within your account. You can also park domain names if you have a .com, for instance, and you register domain addresses with other extensions such as .net, .org or country-code ones to direct them to the main website as a way to protect a brand name.