If you wish to register a domain to ensure that no one else will take it, however, you haven't built the site for it yet, you could park it. That is a feature that registrar companies provide whenever a domain isn't linked to any web or e-mail hosting service. This way, you can protect a brand name, for example, and you'll own the domain in question although it will not open any content. If you wish, you can choose some standard template that the registrar offers, such as For Sale or Under Construction, alternatively you can direct the domain to an alternative web address. Your second option is very helpful if you own a number of domain names, but you want every one of them to open the same website. As an illustration, you may register domain.net and domain.org, then park them and direct them to domain.com. In this example, you are going to need hosting for the third domain address only and the traffic to the other ones will be redirected to it.