Scanning refers to the function of scanning a QR code with a mobile phone to add friends, pay, download mobile phone applications, verify information and obtain relevant information. Wechat and some mobile phone software have this function. You can add WeChat friends, download coupons, buy tickets, browse the web, download mobile applications and so on in your daily life. Use your mobile phone to "sweep", and some people even made their own personal business cards with QR codes. "As long as there is WeChat or QR code reading software on the mobile phone, you can read the QR code at will." Wang Pengfei, Chairman and CEO of Smart Snap, said that QR codes not only bring convenience to users, but also have information security loopholes.
Two-dimensional code (short for quick response code) is the trademark of a matrix barcode (or two-dimensional barcode) first designed by 1994 for Japanese automobile industry. 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.