There are many ways to forward traffic from one domain/website to another. The so-called URL redirection is commonly favored. In contrast to parking a domain, a URL forwarding is feasible only if the domain name in question is hosted. What this means in simple terms is that you can still open any content if you have a direct link to it and you may set up e-mail addresses or subdomains and use them. This sort of function has lots of practical uses - if you choose to switch your domain address, you could redirect the traffic, but the e-mail messages with the old one shall still be active in case you are getting in touch with customers or partners. If you have 2 similar sites and you need to rebuild one of them, you may redirect the traffic to the other site so as to prevent losing potential customers, while you'll still be able to access the administration area for the first site and work on it.