A Letter of Credit is a payment term generally used for international sales transactions. It is basically a mechanism, which allows importers/buyers to offer secure terms of payment to exporters/sellers in which a bank (or more than one bank) gets involved. The technical term for Letter of credit is 'Documentary Credit'. At the very outset one must understand is that Letters of credit deal in documents, not goods. The idea in an international trade transaction is to shift the risk from the actual buyer to a bank. Thus a LC (as it is commonly referred to) is a payment undertaking given by a bank to the seller and is issued on behalf of the applicant i.e. the buyer. The Buyer is the Applicant and the Seller is the Beneficiary. The Bank that issues the LC is referred to as the Issuing Bank which is generally in the country of the Buyer. The Bank that Advises the LC to the Seller is called the Advising Bank which is generally in the country of the Seller.
The specified bank makes the payment upon the successful presentation of the required documents by the seller within the specified time frame. Note that the Bank scrutinizes the 'documents' and not the 'goods' for making payment. Thus the process works both in favor of both the buyer and the seller. The Seller gets assured that if documents are presented on time and in the way that they have been requested on the LC the payment will be made and Buyer on the other hand is assured that the bank will thoroughly examine these presented documents and ensure that they meet the terms and conditions stipulated in the LC.