International trade involves the exchange of goods and services between countries. Almost every product can be found in international markets, including food, clothes, oil, jewelry, and currencies. About 15% of the world's output is traded internationally in a typical year. The WTO helps facilitate international trade by implementing trade agreements, resolving disputes, and reviewing countries' trade policies. While international trade provides benefits like increased efficiency and choice, it also faces challenges such as job losses and high startup costs of entering new markets.