A QR code reader is a device or application that scans and interprets QR codes, which are two-dimensional barcodes. These codes can store various types of information, such as website links, contact details, or product information. Users typically use their smartphones or tablets equipped with a camera and a QR code scanning app to read these codes. When a QR code is scanned, the reader decodes the information and displays it on the screen. This technology is widely used in marketing, ticketing, and payment systems, allowing for quick access to information without the need for manual input.