Eli5: How does the tap feature work for credit/debit cards?

Question

When you tap a credit card How does it read all your card information?

In: 2

Answer 1

It’s like wireless charging. Then the little chip in your card gets near the terminal an electric field makes it come to life and transceives information with the card company.

For security the card has built in keys that will never be used twice but also, never be guessed at random.