The operating system is a set of programs that manages the software and hardware resources of a computer. It simplifies machine use through friendly graphics interfaces. An operating system organizes itself into different levels including the hardware, kernel, central memory, device manager, file system, shell commands, and application programs. Common types of operating systems include single-user systems for one person, multi-user systems for multiple people, and real-time systems that meet processing deadlines.

1. SYSTEM The operating system

3. Organization levels Hardware Core or kernel Central memory Device Manager File system shell command Application Program