The password may be cracked, for example, many people don't pay attention to it, and set the password to a birthday \ phone number or something.

It is also possible to be peeped. For example, entering a password at the counter or entering a password at an ATM may be seen by people you don't pay attention to.

There is also a higher technology, which is to install private devices on credit card devices for copying and stealing bank card information. This kind of equipment is more abroad, and it has also increased in China in the past two years. For example, if you give your card to the cashier, he will handle your card on that machine, and the card number, password and other information on your card can be copied.

In addition, some credit cards don't have a password. Just press OK when you swipe your card.