You must have noticed the bar codes on the consumer packaged products. If you think that with the launch and use of QR codes the bar codes have lost their visibility or importance, you might need to visit the stores then. If you want to develop website like QR code, you must know the difference between QR and Bar code.
They are different in shape; Barcodes are in rectangular with numbers on it, and however, the QR code is in square displaying weird code design,
QR codes hold more data than Barcodes,
Barcodes hold product information, whereas, the QR codes can have hundreds of encrypted data in it.
Which code are you going to use?