Auto document is a term used to describe documents related to automobiles. It can refer to titles, leases, and other documents related to the purchase or ownership of a car. The TITLE is a legal document that proves ownership of a vehicle, while a LEASE is an agreement between a car owner and a lessee that allows the lessee to use the car for a certain period of time. The OPEL is a German automobile manufacturer that produces cars, vans, and SUVs.