A computer operator is responsible for various tasks related to the maintenance and management of computer systems and networks, such as starting, stopping, and restarting computer systems and programs according to schedules or instructions. They must monitor system performance, error messages, and security alerts using consoles, logs, and software tools, as well as troubleshoot and resolve system issues or escalate them to appropriate personnel. Additionally, they must perform backup and recovery operations to protect data and ensure availability. This includes installing, updating, and configuring software and hardware components; testing and verifying system functionality and compatibility; documenting system activities, incidents, and changes; and providing technical support and assistance to users and clients.