If you wish to register a domain name to make sure that nobody else is going to take it, however, you haven't developed the site for it yet, you can park it. That is a service that registrar companies provide whenever a domain name isn't linked to any web or e-mail hosting service. That way, you are able to protect a brand name, for example, and you'll own the domain address in question even though it won't open any content. If you wish, you may choose some default template that the registrar offers, like For Sale or Under Construction, alternatively you can direct the domain to a different web address. Your second option is extremely helpful in case you own a number of domains, but you want every one of them to open the same website. As an illustration, you could register domain.net and domain.org, then park them and direct 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 is going to be redirected to it.