Maintaining software documentation is crucial for ensuring code usability and longevity. Documentation serves as a reference for developers, helping them understand system architecture, functions, and workflows. It aids in onboarding new team members and facilitates better collaboration among teams. Additionally, clear documentation reduces the dependency on specific individuals, allowing for smoother transitions during project handovers or updates. Well-documented software also enhances troubleshooting and maintenance, ultimately leading to improved efficiency and reduced technical debt over time.