[raaman]

What is a bar code? Is it different from QR Code?

[Alaskah]

Barcodes hold 20 characters of data while QR codes hold 7000 (I'm pretty sure).

It's a debate whether the QR code is superior to the barcode or not, but essentially the difference is the amount of data they can hold, as well as their size.

[mrki444]

Some people think bar code soon will be replaced with QR code.