If you want to register a domain name to ensure that no one else is going to take it, but you have not created the site for it yet, you could park it. It's a feature that registrar companies offer when a domain is not connected to any web or email hosting service. This way, you'll be able to protect a brand name, for example, and you'll own the domain address in question even though it won't open any content. If you'd like, you can pick some standard template that the registrar offers, such as For Sale or Under Construction, or you can forward the domain name to another web address. Your second option is very useful in case you own a few domains, but you want each and 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 will need hosting for the third domain name only and the traffic to the other ones is going to be redirected to it.