An auto transport broker is a middleman who connects customers with auto transport carriers, whereas an auto transport carrier is a company that physically transports vehicles from one location to another.

Auto transport brokers do not own their own trucks or equipment, but they work with a network of carriers to find the best transport solution for their customers. They typically provide quotes, arrange for pickup and delivery, and coordinate the details of the transport. Brokers may also provide additional services such as insurance and tracking.

Auto transport carriers, on the other hand, are the companies that physically transport the vehicles from one location to another. They own their own trucks and equipment and are responsible for loading, transporting, and unloading the vehicles. Carriers may specialize in a specific type of transport, such as open or enclosed transport, and may operate on specific routes or regions.

Overall, the main difference between an auto transport broker and an auto transport carrier is that brokers do not physically transport vehicles, but instead facilitate the transport process by connecting customers with carriers. Carriers, on the other hand, are responsible for the actual transport of the vehicle.