How it works
Card fraud is when someone uses a card, or its numbers, without being allowed.
A card number works like a key: it opens things for whoever holds it. So it stays in a wallet, and we never read it out, post it, or send a photo of the card.
A skimmer is a small fake part on a card machine that copies the numbers from a card when it goes in.
Paying by card is normal, and most machines and shops are fine. The care is a habit, like looking both ways before you cross.