“That’s a good start for someone trying to understand it, because the site allows users to upload data – any data – and display it to other users visually. The number of page views your website generates. Or a stock price over time. Weather data. Commodity prices. The number of Bald Eagles in Washington state. Whatever. Uploaded data can be rated, commented and bookmared by other users, helping to sort the interesting (and accurate) wheat from the chaff. And graphs of data can be embedded into websites. So it is in fact a bit like a YouTube for Data.
But then the real fun begins. You and other users can then compare that data to other data sets to find possible correlation (or lack thereof). Compare gas prices to presidential approval ratings or UFO sightings to iPod sales. Track your page views against weather reports in Silicon Valley. See if something interesting occurs. “