If you want to register a domain to make sure that nobody else will take it, but you haven't developed the site for it yet, you may park it. This is a feature that registrar companies provide when a domain isn't connected to any web or email hosting service. That way, you'll be able to protect a brand name, for example, and you'll own the domain in question although it will not open any content. If you'd like, you can pick some default template that the registrar offers, such as For Sale or Under Construction, you can also direct the domain to another web address. Your second option is very useful if you own a number of domains, but you want each and every one of them to open the same website. As an illustration, you can register domain.net and domain.org, then park them and forward them to domain.com. In this example, you will need hosting for the third domain only and the traffic to the other ones will be redirected to it.