Barcode is a way to input numbers and letters into the computer instead of keyboard.

This method can directly input numbers and letters into the computer only by scanning the barcode, without having to hit the keyboard.

The binary level combination of wide and narrow bars and the multi-level combination of the width of the black bar and the width of the white blank part are arranged like a password, and are scanned by the barcode reader that reads this barcode to decode, transmit and input to the computer.