If you'd like to register a domain name to make certain that no one else is going to take it, however, you have not built the web site for it yet, you could park it. That is a service that registrar companies offer whenever a domain isn't linked to any web or email hosting service. This way, you are able to protect a brand name, for example, and you will own the domain in question even though it will not open any content. If you wish, you may choose some default template that the registrar offers, like For Sale or Under Construction, you can also forward the domain name to a different web address. Your second option is very helpful in case you own a few domain names, but you want all of them to open the same website. As an example, you can register domain.net and domain.org, then park them and forward them to domain.com. In this example, you are going to need hosting for the third domain only and the traffic to the other ones is going to be redirected to it.