This is a NTAG215 chip. This is the chip that sits in the base of amiibo figures. When you touch this chip to your Nintendo Switch or other console, it scans the amiibo into the game.
Amiibo cards take that chip, program it to be a specific amiibo, and then cover it with a nice image. Nintendo programs their own official Animal Crossing amiibo cards, but you can also find fanmade amiibo cards of every known amiibo on Etsy as well. Just search “amiibo card” and you’ll find plenty of dealers.
Ntag215 for Amiibo: