Quick Response (QR) refers to a type of code that can be scanned using a smartphone or a QR code reader. These codes store information, such as URLs, text, or contact details, and can be quickly accessed by users. QR codes are commonly used in marketing, allowing businesses to connect customers to websites or promotional content instantly. The technology behind QR codes was developed in the 1990s by Denso Wave, a subsidiary of Toyota. Since then, QR codes have gained popularity due to their ease of use and ability to provide quick access to information without the need for manual input.