What does dynamic password plus SMS mean?

The so-called "mobile banking dynamic password" means that when you operate in mobile banking, the bank will send a short message to your mobile phone number left in the bank at that time in order to confirm that you are operating. The short message contains a password composed of several numbers (mostly 6-8 digits) and letters, which cannot be deciphered because it changes at any time and is not a fixed password in advance. As long as your mobile phone is not lost, the password is only known by the owner, that is, the cardholder. Usually, the password will expire in a few minutes. So it is a relatively safe protective measure. The condition is that the bank card, password and mobile phone cannot be stolen at the same time!