You've probably noticed a square barcode pasted to a graffitied light pole or on the back of a business card. That pixelated code, shaped in a square, is called a QR ...

Add Popular Science (opens in a new tab) More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results.

From their humble beginnings as tools for the automotive industry to being major players during the COVID-19 pandemic, QR codes have come a long way to become must-have tools for marketing and ...