A parked domain name is one that is taken, but it's not associated with some other service - web or e-mail hosting. Put simply, this kind of domain address will not load any actual content in case you type it inside an Internet browser, but no one else can take it as you've already registered it and you are its owner. The advantage of getting a domain and parking it afterwards is that you will be able to keep it and not worry that someone else could possibly register it in the meantime if, for instance, the website for it is not ready yet. You can create a temporary Under Construction page for a parked domain while you are working on your website, or direct it to another web address - temporarily or permanently. The latter option can be employed when you have already registered domain.com, for instance, and you acquire domain.net and domain.org, so that you can protect a brand name or a trademark. In cases like this, the .net and .org domain names can be parked and directed to the .com as you don't need individual websites for them.
