Bar codes store information along one axis, horizontally. QR codes store information in both vertical and horizontal axes, which allows them to hold significantly more data.

If scanning a physical QR code, ensure the code has not been tampered with, such as with a sticker placed on top of the original code. Do not download an app from a QR code.

The pandemic made using QR codes ubiquitous, but does our unquestioning willingness to scan them put us at risk of scams? Authorities think so. Wall Street Journal contributor Heidi Mitchell joins ...

Leave the World Behind features a mysterious QR code that has proven to be hard to scan for many. But what does it lead to? Here’s all the information you need about the QR code in Leave the ...