If you wish to register a domain to make certain that no one else will take it, but you have not built the site for it yet, you could park it. This is a feature that registrar companies provide if a domain is not linked to any web or e-mail hosting service. By doing this, you'll be able to protect a brand name, for example, and you'll own the domain address in question although it won't load any content. If you want, you can select some default template that the registrar provides, like For Sale or Under Construction, you can also forward the domain name to an alternative web address. Your 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 website. As an illustration, you may 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 will be redirected to it.