A tractor trailer is a large vehicle combination consisting of a towing engine, known as the tractor, and a trailer that carries cargo. The tractor is equipped with a powerful engine to pull heavy loads, while the trailer is designed to transport various goods, from food to construction materials. These vehicles are commonly used in the transportation industry for long-distance hauling. They are essential for moving products across cities and states, contributing significantly to the economy by ensuring that goods reach their destinations efficiently and safely.