If you wish to register a domain name to make sure that nobody else will take it, however, you have not developed the site for it yet, you can park it. This is a service that registrar companies provide when a domain address isn't connected to any web or e mail hosting service. In this way, you are able to protect a brand name, for instance, and you'll own the domain address in question although it will not open any content. If you want, you can choose some default template that the registrar offers, like For Sale or Under Construction, you can also direct the domain name to another web address. The 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 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.