NFC (Near Field Communication) amiibo cards work by using a small chip embedded in the card that communicates with an NFC reader, typically found in gaming devices such as the Nintendo Switch or Nintendo 3DS. When the card is brought near the NFC reader, it sends a signal to the reader, which then reads the data stored on the chip.
Each amiibo card contains unique information, such as the character's name, game data, and sometimes even unlockable items or features. When the data is read by the NFC reader, it can be used in various ways, such as unlocking new content, features, or characters in a game.
To use an NFC amiibo card, the user simply needs to hold the card near the NFC reader on their device, and the data will be read and processed automatically. The cards are designed to be small and portable, making it easy to carry and use them on the go.