If you want to register a domain name to make sure that nobody else is going to take it, however, you have not built the website for it yet, you could park it. This is a feature that registrar companies provide when a domain isn't connected to any web or email hosting service. That way, you can protect a brand name, for example, and you'll own the domain address in question even though it will not open any content. If you wish, you can pick some standard template that the registrar provides, like For Sale or Under Construction, alternatively you can direct the domain name to a different web address. The second option is very useful in case you own a number of domains, but you want all of them to open the same site. As an example, you can register domain.net and domain.org, then park them and direct them to domain.com. In this example, you're going to need hosting for the third domain address only and the traffic to the other ones will be redirected to it.