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Software maintenance basically involves  modifying or preserving the quality of an already existing system, and this is important as it ensures the continued efficiency of functions for such a software and hence continually meet up with user demands.

There are mainly 4 types of software maintenance:

  1. Preventive maintenance 
  2. Adaptive maintenance 
  3. Corrective maintenance 
  4. Perfective maintenance 

The most challenging type of maintenance falls between the corrective and the adaptive maintenance. This requires effort to find understand and correct an issue in the system, and adaptive requires insight on how to improve system.

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