Took a flight yesterday and was wondering, what exactly is turbulence?

-BQ: What causes it?It is a special thing invented by airline companies -

Pilots have a switch called "Turbulence ON/OFF" -

When the flight attendants call the pilots "can you get passengers to sit...?" -

They switch "turbulence ON" and when the airplane shakes, they all sit -

Of course they put the "Seat belt sign ON" as well -It's a violent or unsteady movement of air or water, or of some other fluid.



Turbulences are mostly caused by wind shear and pressure differences