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