주차(ju-cha, jucha)
The act of parking a vehicle for a period of time
When to use
Long-term stopping, No-parking zones, Using parking lots
The nuance
Use 주차 when a vehicle is stopped for a longer or defined period, usually in a designated parking area or roadside. Parking in no-parking zones is illegal.
정차(jeong-cha, jeongcha)
The act of briefly stopping a vehicle, mainly for passenger drop-off or short waiting
When to use
Passenger pick-up/drop-off, Brief stop at traffic light, Quick delivery drop-off
The nuance
Use 정차 when a vehicle stops briefly, such as for passenger pick-up/drop-off or short waits like traffic signals. It does not mean long-term stopping like parking.