LOS ANGELES — QR codes are on the rise. I’ve spotted them everywhere, from subway ads (yes, we have subway ads in Los Angeles) to billboards to movie posters to business cards. And so they’ve ...

Among the many changes brought about by the pandemic is the widespread use of QR codes, graphical representations of digital data that can be printed and later scanned by a smartphone or other device.

While they may not be the all-in-one solution some had envisioned, QR codes are still very popular. It’s easy to understand why, too — just point your camera or scanner at a QR code, and you’re ...