A parked Internet domain is one which is taken, but it is not linked to any other service - web or email hosting. To put it differently, this type of domain name will not open any real content when you type it inside an Internet browser, but nobody else can take it as you've already registered it and you are its owner. The benefit of getting a domain and parking it afterwards is that you can keep it and not stress that someone else may register it meanwhile if, for instance, the website for it is not ready yet. You may create a short-term Under Construction webpage for a parked domain name while you're working on your site, or direct it to some other web address - temporarily or permanently. The second option can be used when you have already registered domain.com, for instance, and you obtain domain.net and domain.org, so that you can protect a brand name or a trademark. In this situation, the .net and .org domains can be parked and forwarded to the .com because you do not need different sites for them.