What is a QR code?
A QR (or Quick Response) code is two-dimensional barcode first designed for the automotive industry in Japan. A barcode is a machine-readable optical label that contains information about the item to which it is attached. In practice, QR codes often contain data for a locator, identifier, or reference to a website or application.
QR codes became popular due to their speed and larger storage capacity compared to standard UPC barcodes. Applications include product tracking, item identification, time tracking, document management, website links, and marketing.
A QR code consists of black squares arranged in a square grid on a white background, which are read by an imaging device such as a mobile phone or computer, and then processed to extract the data from horizontal and vertical patterns in the image.