entification is technology that allows almost any object to be wirelessly identified. Basically, if an object is RFID-equipped then data can be transferred from it via radio waves (ie. credit card info or passport info).
This matters to you because if any of your cards have tap-to-pay technology (RFID tech) or you have a recent passport then you should be protecting them from thieves...
Even if skimming is rare, it's just super easy to cover them up and give you peace of mind... plus when they're free it's even easier. 😊