The same problem,
in 15 shapes.

Something got printed. Then it changed. Every industry below has its own version of that, and its own reason the code needs to point somewhere you control.

Restaurants

Change a price without reprinting the table tents.

Menus change constantly and print does not. A code on the table points at a menu you edit yourself, so a sold-out dish disappears in seconds rather than at the next print run.

Read the restaurants guide

Not on the list?

The mechanism is the same everywhere. If you print something today that you might need to change tomorrow, this works for you too.