A parked domain is one that is taken, but it's not linked to some other service - web or email hosting. Essentially, such a domain name won't load any real content when you type it within a web browser, but nobody else can take it as you've already registered it and you are its owner. The best thing about obtaining a domain and parking it afterwards is that you’ll be able to keep it and not stress that somebody else may register it meanwhile if, for instance, the website for it is not ready yet. You could set a temporary Under Construction website page for a parked Internet domain while you are working on your site, or direct it to some other web address - temporarily or permanently. The latter option can be employed if you have already registered domain.com, for instance, and you get domain.net and domain.org, so that you can protect a brand name or a trademark. In this situation, the .net and .org domain names can be parked and directed to the .com since you do not need different sites for them.