A bank guarantee that a seller will be paid once agreed shipping and documentary conditions are met.
A Letter of Credit (LC) is a written commitment issued by the buyer's bank guaranteeing that the seller will receive payment, provided the seller presents the exact documents specified in the LC (such as the Bill of Lading, commercial invoice and inspection certificate).
The Letter of Credit reduces risk for both parties: the exporter is assured of payment by a bank rather than relying on the buyer's creditworthiness, while the importer is assured that payment is released only after the goods are shipped and documents are in order.