Answer:
It is very similar to a bar code and the difference is that the barcode reads the code and extract the information pertaining to the code and usually used in billing system. Here the QR code will take the user to the particular page on the web.
For example, nowadays we have lots of books with QR code, so when the user uses his / her smartphone and scan the code, it will take to user to the company’s page and to read further. Certain QR code needs passcode to view the page. This is very useful to bring a good source browse additional information.