A system administrator is a professional responsible for managing and maintaining the computer systems and networks of an organization. Their duties include installing, configuring, and updating hardware and software, monitoring system performance, troubleshooting issues, ensuring data security and backup, and providing technical support to users. They also collaborate with other IT professionals to develop and implement IT policies and procedures that align with the organization’s goals and objectives. System administrators need to have excellent communication skills, problem-solving ability, and the technical expertise to manage complex computer systems.