Application maintenance refers to the set of activities that are conducted to improve or update an existing computer application, running smoothly with minimum disruption to the users. Maintenance could be corrective, perfective, adaptive, or preventive.

Corrective maintenance involves fixing errors that occur during the application's operation. Perfective maintenance aims to improve the performance, efficiency, and user experience. Adaptive maintenance involves modifying the application to accommodate changes in technology, user requirements, or the business logic. Preventive maintenance is implemented to avoid future errors or problems in the application.
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Application maintenance includes tasks such as debugging, application performance optimization, code optimization, code refactoring, documentation, and updating the application to stay compatible with the current technology trend.