If you wish to register a domain name to make sure that no one else is going to take it, however, you haven't built the website for it yet, you may park it. It's a feature that registrar companies provide if a domain isn't linked to any web or e-mail hosting service. By doing this, you can protect a brand name, for instance, and you'll own the domain in question although it won't load any content. If you'd like, you can choose some default template that the registrar offers, such as For Sale or Under Construction, or you can forward the domain name to a different web address. Your second option is very useful in case you own a few domain names, but you want all of them to open the same website. As an illustration, you could 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 name only and the traffic to the other ones is going to be redirected to it.