If you'd like to register a domain to make sure that no one else will take it, but you have not developed the site for it yet, you may park it. This is a service that registrar companies provide when a domain name is not linked to any web or email hosting service. This way, you'll be able to protect a brand name, for example, and you'll own the domain name in question even though it won't load any content. If you'd like, you can pick some default template that the registrar offers, like For Sale or Under Construction, you can also direct the domain name to an alternative web address. The second option is very helpful in case you own a number of domain names, but you want each and every one of them to open the same site. As an example, you can 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.