Answer:
Shock wave.
Step-by-step explanation:
A wave that will travel faster than the speed of sound. It will generate regions where the pressure is high, in the medium in which the wave travels.
As the wave travels faster than the sound wave, in that medium compressional waves pile up and will result in regions of high pressure. The source that generates the shock waves will be moving ahead of the waves that are produced by it.
Suppose an air craft travels faster than the speed of sound, it will generate shock waves.