Selling a car without a title is illegal in most states as of 2015 and not considered a safe transaction. A title is used to show ownership of a vehicle, and vehicles without a title may indicate a problem with ownership, such as a loan taken on the vehicle.
Vehicles without a title can also indicate that a vehicle has been stolen. The exception of selling a car without a title is selling it to a junkyard for scrap metal. A car can typically be sold to a junkyard for parts or salvage if the seller has a driver's license and registration for the vehicle.