What is 'hydroplaning' (aquaplaning), and what should a driver do if it occurs on a wet highway?

1. The engine floods with water; pump the accelerator pedal vigorously
2. Tires lose direct contact with the road by riding on a film of water; ease off the accelerator and steer straight without braking abruptly
3. The brake pads freeze; apply the handbrake forcefully
4. The car drifts due to wind; turn the steering wheel sharply back and forth