If you want to register a domain name to make sure that no one else is going to take it, but you haven't developed the site for it yet, you could park it. It's a service that registrar companies offer when a domain address isn't connected to any web or e-mail hosting service. This way, you are able to protect a brand name, for instance, and you'll own the domain in question even though it won't load any content. If you'd like, you can choose some default template that the registrar offers, like For Sale or Under Construction, you can also forward the domain name to another 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 site. For instance, you can register domain.net and domain.org, then park them and forward them to domain.com. In this example, you'll need hosting for the third domain only and the traffic to the other ones is going to be redirected to it.