Code rapid response (known as "QR" code) is a very convenient way to display a small bit of information that is easily scanned and processed normally by mobile devices that allow physical items to almost be interactive, providing the information that is easily scanned as a website address.
To make a simple analogy, most people are familiar with Universal Product code (known as a UPC code). Everything you buy in the store (and almost all the shops these days) have one of those cashiers will scan. QR code scanning will help you quickly scan the code and provide all information reading the products.
Image Source : Google
Generating QR codes in an academic setting will help you to learn and analyze the content more easily and profoundly. It offers an excellent way for students to explore the virtual learning world where millions of texts, images, videos, and website links are continuously being posted and upgraded.
Another option would be for me to display a QR code (on my screen), you pick up your phone and scan as the cashier scans the item at the grocery store.
Whole Foods Market (popular in the US / Canada) use this in their stores. I recently sat down to have a bite to eat at the one in Yorkville, Toronto, and on the table where I was sitting was a tented table with two Quick Response codes.