It allows a user to show US demographic characteristics anywhere from the state level down to census tracts and embed the map on the user's own site. The link below will take you to the site that has step by step instructions for creating your own map.
By selecting a demographic layer, adjusting the size settings, and identifying an area of interest, you can simply embed a map or create a link to your website that displays certain demographic information.
Try it out, it's pretty easy! The map below is an example of what you can do. It shows unemployment in the Midwest.