Ever wondered why seemingly harmless Amazon packages are suddenly landing on your doorstep with no sender name, no return address—just a mysterious QR code tucked inside, inviting you to scan it?

Jake Peterson is Lifehacker’s Tech Editor, and has been covering tech news and how-tos for nearly a decade. His team covers all things technology, including AI, smartphones, computers, game consoles, ...

What is a QR code? A QR code (short for Quick Response code) is a two-dimensional barcode that can be read by your smartphone camera. QR codes provide quick access to product information, promotions ...