what is otp number in atm card

An OTP (One-Time Password) is a unique, time-sensitive security code used for online transactions made with your ATM, debit, or credit card. It is a series of 4 to 6 numbers that is not physically present on the card but is instantly sent via SMS to your mobile number registered with the bank when you attempt an online purchase. The OTP serves as a crucial second layer of authentication, ensuring that only the genuine cardholder can authorise and complete the transaction, thereby protecting your account from unauthorised access and fraud.