2D Barcode has only become popular in recent years. Nowadays, a smart phone is used. The camera lens of the camera function is basically equipped, and the QR code can be taken everywhere.
Before 3G was not mature, 2.5G Internet access was popular in Japan. Because it is very troublesome to input URLs on mobile phones, they replaced the website with Barcode barcode symbols. In the initial stage, 1D Barcode was used, and the mobile phone must have a "mini barcode scanner". Later, with a camera phone, the barcode was directly read by the camera on the phone, and the barcode was changed to 2D QR code, which is the origin of the QR code read by the mobile phone.
