If you wish to register a domain name to make sure that nobody else will take it, but you haven't created the web site for it yet, you may park it. That is a feature that registrar companies offer whenever a domain address is not linked to any web or email hosting service. By doing this, you'll be able to protect a brand name, for example, and you will own the domain in question although it will not load any content. If you would like, you may choose some default template that the registrar provides, such as For Sale or Under Construction, or you can direct the domain to a different 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. For instance, you may register domain.net and domain.org, then park them and forward 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 will be redirected to it.