Operating Systems- a software that acts as an interface between a user and a computer.
Functions of an Operating System

• Command Interpretation:
• Memory Management
• Peripheral Management
• Process Management

Types of Operating Systems
Single User Operating System is designed to be used by only one person or user at a time

• Personal Computer(PC)
• Microsoft Disk Operating System(MSDOS)

Multi-User Operating System are capable of running multiple programs concurrently and can share resources. A multi-user system can consists of a computer with several terminals connected to it.

• Dumb Terminal
• Smart Terminal