JDM stands for Japanese Domestic Market and refers to automotive parts and vehicles that are imported from Japan. It involves having a passion for imported Japanese cars and modifying them with authentic stock or performance parts from Japan rather than modifications solely for appearance. JDM modifications can enhance performance or handling for activities like drag racing, drifting, or time attack. Accessorizing a car solely for looks rather than performance is considered "ricing." Popular JDM parts include tow hooks, full exhaust systems, spoilers, wheels, and roll cages.