It's more of a very simple website that you are going to use before you have your actual website built, to gauge interest from potential users.

Usually a 'landing page' consists of a big title / catchphrase, a few points of information about your upcoming product, and a box where you can fill in your email address if you want to subscribe to the mailing list to have more info later. Kind of like what http://launchrock.co/, but less minimalistic I guess.