I own around 10,000 domain names, and 9500 of them are “parked”. The other 500 I use for real sites (like www.CareerRamblings.com). Domain parking is a way to make money from any unused domains that you own. The way it works is that you turn over management of your domain (you still keep ownership of it though) to a domain parking company like Traffic Valet and they create a page for it consisting of link results from a major search engine (Like Google or Yahoo). Everytime a site visitor clicks on one of these links, the domain parking company pays you money. A good example of this is my domain FindJobs.com . 5-6 Years ago I made it into a meta job search engine, where it searched job listings from dozens of sites all on one page. This site cost a lot of money to build and maintain and made very little income, even though it was popular. I shut that down and I now just have the FindJobs.com domain parked and it makes $1000/month, and I do no work to run it. So, I am happy with that.On the other hand, many people would look at a great domain like FindJobs.com and say making $1000/month from it is nothing because it could be built into a big brand and be one of the top job sites, so parking it is a waste. And, they may be right. But, my point is that you should never just let you domains sit there unused. Domain parking is a great way to earn income from a domain until the time you decide to actually build a site on it.