If you'd like to register a domain name to make certain that no one else is going to take it, but you haven't built the website for it yet, you could park it. This is a feature that registrar companies offer when a domain is not connected to any web or email hosting service. This way, you are able to protect a brand name, for example, and you will own the domain name in question even though it will not load any content. If you wish, you can choose some default template that the registrar offers, like For Sale or Under Construction, you can also direct the domain to an alternative web address. Your second option is very helpful in case you own a number of domains, but you want each and every one of them to open the same site. 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 address only and the traffic to the other ones will be redirected to it.