Cash on Delivery (COD) is a payment method where customers pay for goods at the time of delivery rather than in advance. This option is popular for online shopping, as it allows buyers to inspect their purchases before making a payment. With COD, the delivery person collects the cash from the customer and provides a receipt. This method can increase trust for customers who may be hesitant to pay online due to concerns about fraud or product quality. However, it may not be available for all products or in all regions, depending on the seller's policies.