Software Maintenance refers to the process of updating and improving software applications after their initial release. This includes fixing bugs, enhancing performance, and adding new features to meet user needs. Regular maintenance ensures that the software remains functional and relevant over time. There are several types of software maintenance, including corrective, adaptive, perfective, and preventive maintenance. Corrective maintenance addresses issues that arise during use, while adaptive maintenance adjusts the software to work with new hardware or software environments. Perfective maintenance focuses on improving existing features, and preventive maintenance aims to prevent future problems.