A dynamic QR code is a QR code whose destination can be changed after the code has already been downloaded, printed, or distributed. Instead of permanently encoding the final website address into the visible QR pattern, the code points to a managed redirect. When someone scans it, that redirect sends them to the destination you currently have saved.
That extra layer is what makes a dynamic QR useful in the real world. If a menu URL changes, a landing page moves, an event registration page is replaced, or you discover a typo after printing 500 flyers, you can update the destination without replacing the QR image.
With $1 QR Codes, one dollar creates one dynamic QR code with unlimited scans and one full year of management. During that year you can change the destination, QR color, and logo and download updated PNG or SVG files. If you never renew, the QR itself keeps working at the last destination you saved.