What was the bills of exchange in history?

Bills of exchange are financial instruments that date back to at least the Middle Ages, primarily used in international trade to facilitate transactions without the immediate transfer of cash. They are written orders that bind one party to pay a specified sum to another party at a designated future date. This instrument allowed merchants to mitigate risks associated with long-distance trade, enabling credit and deferred payments. Over time, bills of exchange evolved into essential components of modern banking and finance, laying the groundwork for contemporary payment systems.