Maintenance is inevitable for almost any kind of product. However, most products need maintenance due to the wear and tear caused by use. On the other hand, software products do not need maintenance on this basis, but need maintenance for the following reasons:

1.    Correct Problems: Errors undetected during software development may be found during use and required correction.

2.    Enhance Software Product: Over a period of time, original requirements of the software may change to reflect the customer’s needs.

3.    Adaptation of Products to New Environments: With time new technologies are introduced such as new hardware, operating system etc. The software therefore must be modified to adopt to the new operating environment.

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