Write short notes on Software Maintenance.
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Software maintenance in software engineering is the modification of a software product after delivery to correct faults, to improve performance or other attributes.
A common perception of maintenance is that it merely involves fixing defects. However, one study indicated that over 80% of maintenance effort is used for non-corrective actions. This perception is perpetuated by users submitting problem reports that in reality are functionality enhancements to the system.[citation needed] More recent studies put the bug-fixing proportion closer to 21%.
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* software is a program that Run is a computer.
* it is a instruction that tell a computer
* what do you software is the entire set of programs ' producer and routine associated with the operator of a computer system .
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