If you want to register a domain name to make sure that nobody else is going to take it, however, you haven't built the web site for it yet, you could park it. This is a feature that registrar companies provide whenever a domain is not connected to any web or email hosting service. That way, you'll be able to protect a brand name, for instance, and you will own the domain in question even though it will not load any content. If you wish, you may choose some standard template that the registrar offers, like For Sale or Under Construction, alternatively you can forward the domain to a different web address. Your second option is very useful in case you own a number of domains, but you want all of them to open the same site. 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 address only and the traffic to the other ones will be redirected to it.