There are various ways to redirect site visitors from one domain/website to another. The so-called URL redirection is commonly recommended. In contrast to parking a domain name, a URL redirection can be done only if the domain name 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 create email addresses or subdomains and use them. Such a feature has many practical uses - if you want to switch your domain name, you could forward the visitors, but the e-mail messages with the old one will still be active in the event that you are getting in touch with clients or partners. If you have 2 identical sites and you need to rebuild one of them, you can redirect the traffic to the other website so that you can prevent losing potential clients, while you'll still be able to access the admin area for the first website and improve it.