If you want to register a domain name to ensure that no one else will take it, but you have not built the web site for it yet, you can park it. It's a service that registrar companies provide when a domain is not linked 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 address in question although it won't open any content. If you wish, you may choose some standard template that the registrar offers, like For Sale or Under Construction, or you can direct the domain name to another web address. The second option is extremely helpful in case you own a number of domains, but you want each and every one of them to open the same site. As an example, you could 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 only and the traffic to the other ones will be redirected to it.