Answer Posted / ravi

error:- a human action that give incorrect results

failure:-A Failure is a ‘Deviation of the component or
system from its expected delivery, service or result’
Failures can be caused by environmental conditions as well
E.g. radiation, magnetism, electronic fields
Pollution can cause faults in firmware or influence the
execution of software by changing hardware conditions.

defect:A flaw in a component or system that can cause the
component or system to fail to perform its required function

Bug:A mistake in coding called 'error'.If that error
identified by test engineer called defect. That defect is
fixed by developer is called bug.

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