There are many ways to forward traffic from one domain/website to another. The so-called URL redirection is frequently preferred. In contrast to parking a domain, a URL forwarding can be done only if the domain in question is hosted. What this means essentially is that you could still open any content in case you have a direct link to it and you could set up e mail addresses or subdomains and use them. Such a feature has numerous practical uses - if you decide to switch your domain, you could redirect the traffic, but the e-mails with the old one will still be active in case you are making contact with customers or partners. When you have 2 identical Internet sites and you intend to rebuild one of them, you could forward the website visitors to the other Internet site so as to avoid losing potential clients, while you shall still be able to access the admin area for the first Internet site and work on it.