A parked domain address is one that's taken, but it is not connected to another service - web or e-mail hosting. Essentially, such a domain won't load any actual content when you type it inside a browser, but no one can take it as you have already registered it and you are its owner. The advantage of getting a domain name and parking it afterwards is that you are able to keep it and not worry that somebody else may register it in the meantime if, for example, the website for it is not ready yet. You could set a temporary Under Construction page for a parked Internet domain while you're working on the website, or forward it to some other web address - temporarily or permanently. The second option can be used when you have already registered domain.com, for example, and you acquire 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 don't need individual websites for them.