Perfective maintenance refers to the process of improving a software system by enhancing its performance, usability, or functionality. This type of maintenance is focused on making the system better, rather than just fixing bugs or issues. It often involves adding new features or optimizing existing ones to meet user needs more effectively. This maintenance is typically performed after the initial release of the software and can be driven by user feedback or changing requirements. By implementing perfective maintenance, organizations can ensure that their software remains relevant and competitive in a constantly evolving market.