If you want to register a domain to make certain that no one else is going to take it, but you haven't developed the site for it yet, you can park it. That is a service that registrar companies provide when a domain address isn't connected to any web or e-mail hosting service. By doing this, you'll be able to protect a brand name, for example, and you will own the domain in question even though it won't load any content. If you wish, you can choose some default template that the registrar provides, like For Sale or Under Construction, or you can direct the domain to an alternative web address. Your second option is very helpful if you own a number of domain names, but you want each and every one 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 will need hosting for the third domain only and the traffic to the other ones is going to be redirected to it.