The primary use of QR codes in modern technology is to provide quick access to information. By scanning a QR code with a smartphone or tablet, users can be redirected to websites, display text, or share contact details with ease. This functionality supports numerous applications, from marketing and advertising to ticketing and payments. Their capability to store a significant amount of information in a compact format has made QR codes a popular choice in various industries, enabling seamless data sharing and navigation in the digital age.