QR Code (Quick Response code) A two-dimensional bar code that is widely used to cause a Web page to download into the user's smartphone when scanned with a mobile tagging app. QR codes can also be used to capture a phone number, for business card contact data, and they can simply display information. They can also be used to send a text message (SMS) to a specific number with a message. Here are some tips and information to know more about QR Codes.