QR Code
QR Code (Quick Response Code) is a two-dimensional barcode that stores data in a matrix of black and white squares, designed for fast readability and high data capacity. It is widely used to encode information such as URLs, text, contact details, or payment data, which can be scanned and decoded by smartphones or dedicated scanners. QR codes are popular for marketing, ticketing, authentication, and contactless transactions due to their ease of generation and scanning.
Developers should learn QR codes when building applications that require quick data transfer, such as mobile apps for payments, event check-ins, or digital menus, as they provide a simple, cross-platform way to share information without manual input. They are essential in scenarios like contact tracing, inventory management, or marketing campaigns where linking physical objects to digital content enhances user engagement and operational efficiency.