A key concept in banking is the notion of liability. Put simply, a liability is a financial obligation that must be fulfilled. This can take two forms: direct or contingent. Direct liability refers to debts that must be repaid, such as a trade finance loan or a special documentary credit establishment. On the other hand, contingent liability is a potential obligation that may or may not come to fruition, such as an import documentary credit that is never utilized. It is important to understand these distinctions in order to have a comprehensive understanding of banking and finance.