"A flight recorder is an electronic recording device placed in an aircraft for the purpose of facilitating the investigation of aviation accidents and incidents. Flight recorders are also known by the misnomer black box—they are in fact bright orange to aid in their recovery after accidents.
There are two different flight recorder devices: the flight data recorder (FDR) preserves the recent history of the flight through the recording of dozens of parameters collected several times per second; the cockpit voice recorder (CVR) preserves the recent history of the sounds in the cockpit, including the conversation of the pilots. The two devices may be combined in a single unit. Together, the FDR and CVR objectively document the aircraft´s flight history, which may assist in any later investigation." - (en.wikipedia.org 29.02.2020)
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