A QR code is often a sq. barcode that can comprise info for instance a URL, Wi-Fi password, or Speak to card, and it might be scanned very easily by a smartphone digicam.
A QR code for that URL in the English Wikipedia https://chiarasful664804.theblogfairy.com/28699581/the-smart-trick-of-code-qr-outlook-that-no-one-is-discussing