The difference between passenger cars and commercial vehicles is:

1. Different purposes: Passenger cars are usually used for personal and household purposes; Commercial vehicles are primarily purchased by companies for the purpose of transporting goods or personnel.

2. Different definitions: Passenger cars refer to sedans and cars with less than 9 seats, mainly used for passenger transportation, including SUVs, MPVs, racing cars, and household pickup trucks; Commercial vehicles refer to all trucks, specialized vehicles, construction vehicles, all passenger cars with more than 9 seats, as well as tractors, agricultural vehicles, etc. A passenger car is a vehicle primarily designed and technically designed to carry passengers and their carry on luggage or temporary items, with a maximum of 9 seats including the driver's seat.