What does dynamic code mean?

Dynamic code is a way to verify personal information. For example, if you want to log in to your account and enter your password, he will prompt you that you have sent the verification code. Just enter the verification code to log in. But this verification code is called dynamic verification code because it has a validity period and most of it must be entered within 3 minutes. If it expires, it will be invalid. Therefore, I think there is little risk that the verification code will be leaked by SMS, and it is as useless as a long time.