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more on QR-Codes

A QR-code (abbreviated from Quick Response code) is a type of matrix barcode (or two-dimensional 'machine-readable optical label') invented in 1994 by the Japanese automotive company Denso Wave. In practice, QR-codes often contain data for a locator, identifier, or tracker that points to a website or application.
QR-code From Wikipedia, the free encyclopedia -- edited
Firefox for iOS has a QR-code reader to allow a user to load a webpage or search for words from a QR-code. This article will show you how to scan a QR-code. ... After scanning, if the QR-code is a web address, the page will open.
Scan QR-codes in Firefox for iOS | Firefox for iOS Help
To further tie his dish in with the brief, Oli also had QR codes printed on the lids of the boxes which, when scanned on a phone, took diners to an online menu. Many restaurants have adopted QR codes to replace menus during the pandemic for hygiene reasons, as Oli explains: ‘They’ve been an absolute saviour. In London and Hong Kong we don’t print menus, we just use QR codes. They also really help with the sustainability thing too as printing menus is such a waste of paper and time.’
The BBC TV Show Great British Menu QR-Codes reaching the final from Great British Menu 2021: Oli Marlow on his winning main course