The main purpose of QR codes in modern technology is to facilitate quick and easy access to information or links by scanning the code with a smartphone camera. QR codes can encode various types of data, including URLs, contact information, and text. This technology has become increasingly popular in marketing and advertising, allowing businesses to direct consumers to websites or social media platforms with minimal effort. Additionally, QR codes are used in payments, event ticketing, and product tracking, providing a seamless experience in the digital world while enhancing user engagement and convenience.