Customs officers are government employees responsible for monitoring and regulating the flow of goods and people across national borders. They work at ports, airports, and border crossings to ensure that all items entering or leaving a country comply with laws and regulations. Their duties include inspecting luggage, checking shipping containers, and collecting tariffs on imported goods. These officers play a crucial role in preventing illegal activities, such as smuggling and trafficking. They also help protect public health by ensuring that prohibited items, like certain foods and plants, do not enter the country. Overall, customs officers help maintain national security and facilitate international trade.