1. QR code (referred to as quick response code) is the trademark of a matrix barcode (or two-dimensional barcode) designed by 1994 for Japanese automobile industry for the first time. Bar code is a machine-readable optical label, which contains information related to the attached items. In fact, QR codes usually contain data pointing to locators, identifiers or trackers of websites or applications. Two-dimensional code uses four standardized coding modes (numeric, alphanumeric, byte/binary and Chinese characters) to store data efficiently, and can also use expansion. The two-dimensional code is composed of black squares arranged in a square grid on a white background, which can be read by imaging equipment such as cameras and processed by Reed-Solomon error correction until the image is correctly interpreted. Then extract the required data from the horizontal and vertical patterns of the image.
2. The QR code system was invented by Denso Corporation of Japan in 1994. Its purpose is to track the vehicle in the manufacturing process; It is designed to allow high-speed element scanning. QR codes are now widely used, including commercial tracking applications and convenient applications for mobile phone users (called mobile tags). QR codes can be used to display text to users, add electronic business card contacts to user devices, open uniform resource identifiers (URIs), connect to wireless networks, or compose emails or text messages. There are many QR code generators that can be used as software or online tools. QR code has become one of the most commonly used QR code types.
Third, QR codes have been popularized in consumer advertisements. Usually, smart phones are used as QR code scanners to display codes and convert them into some useful forms (for example, the standard URL of a website to prevent users from entering them into the browser). Two-dimensional code has become the focus of advertising strategy, because it provides a faster way to visit brand websites than manually entering web addresses. In addition to bringing convenience to consumers, this ability is also very important, because it improves the conversion rate: contact with advertisements turns into sales. It gathers interested potential customers to the downstream of the conversion funnel with almost no delay and no effort. Let the audience immediately enter the advertiser's website for a longer and more targeted promotion, which may lose the audience's interest.