QR codes can house a whole lot of data, from the URL of a webpage or service, to where to directly download an app. Here's how to scan them.

Using the RedLaser scanning technology, repeat sellers can scan a product and list it on eBay in 60 seconds or less.

But really, anytime there is a QR code, the tell-tale sign on if it's real is in the details. "You can scan the code, but you need to pay close attention to what that URL is.