3D Secure (3DS) is a system for enhancing security when you make purchases over the internet.
After you have checked out and entered your card details, you may be taken to a screen that requests a One Time Passcode (OTP). This OTP will be sent to both your registered mobile phone number and your registered email address. You will need to enter this code before the site's timer expires in order to complete your transaction. You may also be asked to answer a further security question.