QR Code (Quick Response Code):-

          The QR code system was invented in 1994 by the Japanese company Denso Wave. It is a two-dimensional (2D) barcode used for adding web links to a printed page.When you scan such a QR barcode using a webcam or mobile phone camera, the QR application takes you to a website, a YouTube video or some other web content. It is an easy way of sending people to a site without having to type of URL.

       QR code often contain data for a locator, identifier, or tracker that points to a website or application. A QR code uses four standardized encoding modes (numeric, alphanumeric, byte/binary, and kanji) to store data efficiently.The smallest element (black or white square grid) of the QR code is called a module.