Software Maintenance

Software maintenance is the modification of a software product after delivery to correct faults, to improve performance or other attributes, or to adapt the product to a modified environment.
The bug-fixing view- maintenance is the detection and correction of errors.
The need-to-adapt view - maintenance is making changes to software when it's operational environment or original requirement changes.
The user-support view - maintenance is the provision of support to users.

Why software maintenance is needed?

To provide continuity of services
To support mandatory upgrades
To support user requires for improvements
To facilitate future maintenance work