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The term black box has a number of meanings:
Black box is technical jargon for a device or system or object when it is viewed primarily in terms of its input and output characteristics. Almost anything might occasionally be referred to as a black box, e.g., a transistor, the Internet. Some other common uses are:
In computer programming and software engineering, black box testing is used to check that the output of a program is as expected given certain inputs. The term black box is used because the actual program being executed is not examined.
The opposite of this sort of black box has been called white box, glass box, or clear box.
In aircraft, the flight data recorders and cockpit voice recorders, that record aircraft and pilot behavior in order to analyze accidents are called black boxes by the news media; though they are now bright orange in colour, they were black when originally introduced, and the name stuck.