If you want to register a domain to make certain that nobody else is going to take it, but you have not developed the web site for it yet, you could park it. This is a service that registrar companies offer whenever a domain name is not linked to any web or email hosting service. That way, you can protect a brand name, for instance, and you'll own the domain in question although it won't load any content. If you would like, you can choose some default template that the registrar provides, such as For Sale or Under Construction, or you can forward the domain to another web address. The second option is extremely helpful in case you own a number of domain names, but you want each and every one of them to open the same site. For instance, you can register domain.net and domain.org, then park them and forward them to domain.com. In this example, you will need hosting for the third domain name only and the traffic to the other ones is going to be redirected to it.