If you want to register a domain name to ensure that nobody else is going to take it, however, you have not developed the website for it yet, you can park it. This is a service that registrar companies offer if a domain name is not linked to any web or email hosting service. By doing this, you are able to protect a brand name, for example, and you'll own the domain name in question even though it will not open any content. If you would like, you can choose some default template that the registrar offers, like For Sale or Under Construction, you can also forward the domain name to a new web address. The second option is very helpful in case you own a few domains, but you want all of them to open the same website. For instance, you could register domain.net and domain.org, then park them and direct them to domain.com. In this example, you are going to need hosting for the third domain only and the traffic to the other ones is going to be redirected to it.