What is Quick Response Code (QR Code)?

A quick response code (QR code) is a type of matrix barcode that uses a machine-readable optical label (typically scanned with a mobile phone) containing sensitive information about the item it is attached to. QR codes often contain data for a tracker, locator, or identifier that points to a mobile application or website. QR codes use four standardized encoding methods (byte/binary, alphanumeric, numeric, kanji) to store data.