Navigation: Developer Force | Web Sites
Force.com offers two different technologies for publishing content based on your apps.
Site.com is a solution that let's you deliver web sites at the speed of social. Create once, publish anywhere -- to your own web sites, social channels like Facebook -- where ever your brand lives. Site.com makes it easy to build professional, high-performance web sites that deliver dynamic content in real-time and optimize them for consumption on all devices, including mobile.
Force.com Sites is the solution for you when you want to publish data to the world using Visualforce pages. Force.com Sites also allows you to authenticate access to specific pages that expose data from your internal database.