Auto refers to vehicles that are self-propelled, typically powered by internal combustion engines or electric motors. These vehicles, commonly known as cars or automobiles, are designed for transportation on roads and are widely used for personal, commercial, and industrial purposes. They come in various types, including sedans, SUVs, trucks, and electric cars, and play a crucial role in modern mobility, providing convenience, speed, and accessibility. Advances in technology are also leading to the development of autonomous or self-driving cars, shaping the future of transportation.