Originally developed in the mid-1990s for manufacturing and inventory control, QR codes most often appear as a small graphic that looks like randomly placed small black squares arranged in a ...

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.

QR codes are everywhere these days – on product packaging, tucked into direct mail, strategically placed around retail stores, at check-in stations at doctor’s offices and even in seemingly random ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...