They usually maintain the essentials such as operating systems, business applications, security tools, web-servers, email, PCs, local and wide area networking both hardware and software and mid-range server hardware.
Other duties may include scripting or light programming, project management for systems-related projects.
In charge of the computer systems all the parts that make a computer function.
Responsible for the upkeep, configuration, and reliable operation of computer systems; especially multi-user computers, such as servers.