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Error -Defect-Failure

Error:
This is a human action that produces an incorrect result.
E.g-Programming error.

Defect:
A incorrect flow in the system which does not give the actual output is called Defect.
E.g-Incorrect Statement

Failure:
A defect caught during execution may cause failure.Rather deviation from its original outcome.

Causes of software failure:

1.---Human Error:It may be introduced into a code to a system.
---Reasons for it:1.Time pressure
2.Complexity
3.Exessive demands
4.Wrong Understanding
5.Wrong Requirement
6.Distraction
2.---Environmental Condition
----Changes in the system Environment
----Reason for it:
1.Magnetism
2.Radiation
3.Hard disk Crashes
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