The QR code itself is virus-free. Now, shopping, installing software, signing in for meetings, accessing web pages and so on can be solved by scanning QR codes, downloading mobile phone software on regular websites, and using software that can identify the security of QR codes.

Two-dimensional code (also called two-dimensional bar code) refers to another readable bar code based on one-dimensional bar code, which uses black and white rectangular patterns to represent binary data, and the information contained in it can be obtained after scanning by equipment.