What is QR Code?

A QR Code (Quick Response Code) is a two-dimensional barcode that can store text, URLs, contact info, or other data. Invented in Japan in 1994, QR codes are read by smartphone cameras and dedicated scanners. They use a pattern of black and white squares on a grid and can hold up to several hundred characters depending on version and error correction level. QR codes support error correction, allowing partial damage without losing data. Common uses include payment apps, marketing, and ticketing.