The balance of payments is a systematic record of a country's external economic transactions over a period of time. It includes visible and invisible items, recording transactions of both goods, services, and capital. The balance of trade is part of the current account and records only merchandise exports and imports, while the balance of payments provides a more complete picture of a country's international economic relations by also including financial and other non-physical flows. Imbalances in the balance of payments can be caused by factors like trade cycles, economic development, national income levels, and external borrowing. Currency appreciation means the domestic currency gains value against foreign currencies, while depreciation means it loses value.