Technology
How Do QR Codes Work?
A QR code is a pattern that encodes information as black and white squares. Here's how phones read them instantly — and why screenshots work just as well as the real thing.
technologyqr codes
Technology
How Do Barcodes Work?
Barcodes encode numbers as patterns of black bars and white spaces. A scanner reads reflected light, converts the pattern into digits, validates it with a check digit, and looks up the product in a database.
howtechnology