Read Also - GSM Full Form | What Is GSM
It is called One Time Password because it can be used only once, it is not possible to use it for the second time, it has been created keeping in view your Extra Security. There is a deadline to use OTP which can be from 1 to 30 minutes. The advantage of OTP is that it keeps your account secure whether it is a bank account or a Google account , Facebook Account , Twitter or any other website account. OTP Code is the safest Verification Code for the security of your account.