A QR code (Quick Response code) is a two-dimensional barcode that stores information in a grid of black squares on a white background. It can be scanned using a smartphone or a QR code reader to quickly access embedded data such as URLs, text, contact details, or payment information. QR codes are widely used in marketing, ticketing, product packaging, and digital payments due to their convenience and fast readability. They enhance user engagement by providing instant access to websites, apps, and multimedia content. With their ability to store large amounts of data and support error correction, QR codes have become an essential tool in modern digital communication.