A lamp for a vehicle includes an optical output unit and at least one processor. The at least one processor is configured to: determine a partitioning of a light emitting area of the optical output unit into a plurality of light emitting groups; control a sequential turn-on operation that turns on the plurality of light emitting groups in a first sequential order in a first color; and control a sequential turn-off operation that turns off the plurality of light emitting groups in a second sequential order.