What is Operating system 

An operating system is a set of programs that coordinates all the activities among computer hardware devices. It provides a means for users to communicate with the computer and other software. The most common operating system in used today are: Microsoft’s Windows and Mac OS


·         =Single-user or personal user

·        = Multi-user

·         =Networked

·         =Online Operating System

·         =Real time system

·         =Batch processing Systems