An NFC business card is a physical card embedded with a small near-field-communication chip that shares your contact details — or a full digital profile — when someone taps it with their smartphone.
It combines the tangible hand-off of a traditional card with the flexibility of a digital one: the physical card never needs reprinting, because the linked information can be updated anytime from your end.
NFC cards cost more per unit than printed cards, which makes them worth the investment mainly for people who attend frequent in-person events and want both the ritual of handing something over and the convenience of instantly shareable, always-current information.