A parked domain address is one which is taken, yet it is not linked to some other service - web or e mail hosting. Put simply, this kind of domain will not open any real content in case you type it inside a browser, but no one else can take it as you've already registered it and you are its owner. The advantage of obtaining a domain name and parking it afterwards is that you can keep it and not worry that someone else might register it in the meantime if, for instance, the site for it is not ready yet. You can create a temporary Under Construction page for a parked domain while you're working on the web site, or direct it to some other web address - temporarily or permanently. The latter option can be employed when you have already registered domain.com, for instance, and you obtain domain.net and domain.org, in order to protect a brand name or a trademark. In this case, the .net and .org domain addresses can be parked and forwarded to the .com as you do not need separate sites for them.