If you wish to register a domain to ensure that nobody else will take it, but you haven't developed the web site for it yet, you may park it. That is a feature that registrar companies provide whenever a domain address is not connected to any web or e-mail hosting service. In this way, you'll be able to protect a brand name, for instance, and you'll own the domain address in question although it won't open any content. If you would like, you can choose some default template that the registrar offers, such as For Sale or Under Construction, you can also direct the domain to a different web address. The second option is very useful in case you own a number of domains, but you want every one of them to open the same website. For example, you can register domain.net and domain.org, then park them and forward them to domain.com. In this example, you're going to need hosting for the third domain name only and the traffic to the other ones will be redirected to it.