Flight Data Recorder (FDR), is a crashworthy device that records data about an aircraft's actual flight condition (airspeed, heading, altitude, pitch, etc..), it helps aviation experts and investigators determine the cause of a plane crash.
The Flight Data Recorder is encased in heavy steel and covered by multiple layers of insulation to provide protection against blunt force, fire, and extreme climatic conditions. It is popularly called a "black box" although the Flight Data Recorder is actually painted a bright orange or red so that in an event of a crash it would be easier to locate. The reason for the "black box" term is because when they recover it, it's all covered up with black soot.
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