A sight letter of credit refers to a document that verifies the payment of goods or services, payable once it is presented along with the necessary documents. These types of letters of credit are designed to provide additional protection to parties involved in international trade and include the buyer, the seller, and the issuing bank. It differs from an at-sight letter because an at-sight letter of credit commits itself to pay the agreed amount once the provisions of the letter of credit are met. An at-sight letter of credit is a type of letter of credit.