The Customs Service is a government agency responsible for regulating the flow of goods and people across national borders. Its main duties include inspecting shipments, collecting tariffs, and enforcing laws related to trade and immigration. This ensures that illegal items, such as drugs or weapons, do not enter the country and that all goods comply with local regulations. Additionally, the Customs Service plays a vital role in protecting national security and promoting fair trade practices. By monitoring imports and exports, it helps prevent smuggling and fraud, while also facilitating legitimate trade to support the economy.