A semi-truck is a large vehicle commonly used for transporting goods over long distances. It consists of two main parts: the tractor, which is the front section that contains the engine and driver's cab, and the trailer, which is the rear section that carries the cargo. Semi-trucks are designed to haul heavy loads and can be seen on highways and roads across the country. These vehicles are essential for the logistics and transportation industry, helping to move products from manufacturers to retailers. They often operate in conjunction with other transportation methods, such as trains and ships, to ensure efficient delivery. The use of semi-trucks supports the economy by facilitating trade and commerce.