If you'd like to register a domain to make sure that no one else is going to take it, but you have not built the web site for it yet, you may park it. That is a feature that registrar companies offer whenever a domain address isn't linked to any web or email hosting service. This way, you can protect a brand name, for instance, and you'll own the domain in question even though it will not load any content. If you would like, you can choose some standard template that the registrar provides, such as For Sale or Under Construction, you can also forward the domain to a new web address. Your second option is very helpful in case you own a few domains, but you want every one of them to open the same site. As an illustration, you can register domain.net and domain.org, then park them and direct them to domain.com. In this example, you're going to need hosting for the third domain only and the traffic to the other ones is going to be redirected to it.