A QR code, or Quick Response code, is a two-dimensional barcode that contains information that can be read by a barcode scanner or a smartphone camera. QR codes can be used to encode different types of data, such as website URLs, contact information, product information, or other types of text or data. QR codes consist of black and white squares arranged on a grid, with specific patterns that allow scanners to read and interpret the encoded information. When a user scans a QR code with their smartphone camera or other scanning device, they can access the encoded information, which may include links to websites, contact details, or other relevant information. QR codes are commonly used in marketing, advertising, and customer engagement, as well as in logistics, inventory management, and other areas where quick and efficient data transfer is important.