There are two separate services you need for a functioning website - a domain name and a website hosting plan for it. Each time you type the domain address in your web browser, you see the content that is uploaded in the website hosting account, but if that domain is not linked to such an account or to an email service, it is parked. In other words, the domain 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 main advantage of parking a domain is that you can keep it and be sure that no one else is going to take it. In the meantime, it won't block a slot for a hosted domain inside your account. In addition, you can park domains if you have a .com, for example, and you register domain names with other extensions such as .net, .org or country-code ones to forward them to the main website as a way to protect a brand name.