‘QR code’ stands for Quick Response Code, a square bar-code which can contain various types of media including simple text, a URL, a picture, a video, a phone number, a contact… Practically anything you can think of wanting to ever send to someone can be included in a QR code. The only way a QR code can be read is through a QR code reader – which can be downloaded for free on any smartphone or tablet. This way, you can see the media held within the pixels.
One of the great things about QR codes is the fact that you can insert them into Word documents, PowerPoint presentations, etc.
HRC e-Learning Blog 