System software consists of programs to control the operations of computer equipment
 
Instructions in the operating system tell the computer how to perform the functions of loading, storing, and executing an application program and how to transfer data
 
When a computer is turned on, the operating system is loaded into the computerís memory from auxiliary storage, a process called booting
 
Most computers use an operating system that has a graphical user interface (GUI)

User Friendly  - The software is easy to be used.