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Software Maintenance Types: Corrective, Adaptive, Perfective, and Preventive Software Maintenance. Corrective maintenance is about correcting software defects, errors and faults. Perfective software maintenance focuses on features that improve the user experience through functional enhancements. Preventive software is about future-proofing its longevity and efficacy by implementing good practices for long-term gain. It's not about simply fixing a specific problem but being able to anticipate change and thus making your software flexible enough to adapt to a plethora of changes.