COD is a short form of 'CASH ON DELIVERY'.This is one of the payment modes by which we can make payments for the products which we buy online.In CASH ON DELIVERY,you do not need to make any advanced payment while placing your order and instead you pay when your product has been delivered to your desired address in the form of cash.Please Like below if anyone finds this answer useful.Thank You.I have also posted one question about this flash drive,please check it out and answer me if anybody knows.