Maintaining system documentation in IT is crucial for several reasons. It ensures that all stakeholders, including developers, IT staff, and end-users, have access to essential information about system architecture, processes, and troubleshooting steps. This accessibility facilitates knowledge transfer during onboarding and reduces the likelihood of errors. Well-maintained documentation also aids in regulatory compliance and enhances the overall management of the IT environment by providing a clear understanding of systems, leading to more efficient maintenance and improved security practices.