Is Buying/Selling A Car With No Title Allowed Or Legal?

If you have  the keys, the VIN, and possession of the vehicle is that enough to make it legal?

• #autos_vehicles
• #dmv
• #duplicate_title
• #replacement_title
• #car_title
• #vehicle_title
• #car_title_solution
• #car_title_online
• #classic_car_title
• #bill_of_sale
• #lost_title
• #no_title