If you are a frequent flyer, we don't need to tell you what air turbulence feels like. You might want to know what causes it, or are worried as to whether it is dangerous ... whether it can bring down the aircraft or cause it to explode.
FAA Air Turbulence Stats
In 2013, 24 people (11 passengers and 13 crew members) were injured in turbulence-related incidents in the United States. Not a big number as such, considering that over 600 million people fly in the US every year.