A family on vacation walks toward a theme park on a humid afternoon, balancing bags and bottled water. The kids drift toward an ice-cream cart while their parents shuffle between a printed map, the ...

THEY SEEM TO BE JUST ABOUT EVERYWHERE. QR CODES OR QUICK RESPONSE CODES ARE SMALL BARCODES THAT WHEN YOU SCAN THEM WITH YOUR PHONE, TAKE YOU JUST ABOUT ANYWHERE. LIKE THIS RANDOM YOUTUBE VIDEO OF ME ...

A QR Code scan is like a raised hand in a crowded room. It's voluntary, visible, and tells you exactly who's interested. Compare that to website cookies, which are more like secretly following someone ...

Forbes contributors publish independent expert analyses and insights. Davey Winder is a veteran cybersecurity writer, hacker and analyst. The simple answer, and the one most often provided in online ...