Collect on Delivery (COD) is a payment method used in shipping and delivery services. With COD, the recipient pays for the goods at the time of delivery rather than in advance. This option is often preferred by customers who want to ensure they receive their items before making a payment. When a package is sent using COD, the delivery service collects the payment from the recipient and then transfers it to the sender. This method can provide peace of mind for buyers, as they can inspect the product before completing the transaction.