Land or "ground" shipping can be either can either by train or by train or by truck. Trucking is easily the most popular form of shipping. Even in Air and Sea shipments, ground transportation is still required to take the product from its origin to the airport or seaport and then to its destination Ground transportation is more affordable than air shipments. However, It is more expensive than shipping by sea. Trucks are also much faster than ships and rail but slower then planes. Many trucks take freight directly from the shipper to its destination. This is known as a door to door shipment.