This document defines an operating system as the most important software that acts as an interface between the user and computer hardware, allowing users to communicate with the computer without needing to understand its language. An operating system performs basic tasks like handling input/output, tracking files and directories, and controlling devices. It effectively manages and controls all computer resources. Common operating system functions include process management, memory management, file management, security, and facilitating communication between the user and computer. User interfaces allow users to interact with and control the display to communicate with the operating system.

1. An Introduction to
Operating Systems

2. Definition
 An Operating System is the most
important software without which no
computer system can work.
 OS works as an interface between
the user and hardware.
 OS helps to communicate with the
computer without knowing how to
speak the computer’s language.
 It is impossible for the user to use
any computer or mobile device
without having an OS.
 An OS performs basic tasks, such
as recognizing input from the
keyboard, sending output to the
display screen, keeping track of
files and directories on the disk,
and controlling peripheral devices
such as printers.

3. Need of Operating System
 Hardware is nothing but a machine which requires instruction to
work
 OS is the software which manages and controls all the resources of
the computer
 It effectively utilize every part of the computer.

4. Example of OS

5. Functions of Operating System
 Process Management
 Device Management
 Memory Management
 File Management
 Security
 Means of Communication between user and
computer

6. Example of Processor
Management

7. User Interface
It is program that controls a display for the user
,which allows the user to interact with the
system and to communicate with the
operating system.
 TYPES OF UI
 Command Line Interface
 Graphical User Interface

8. Types of OS
 Real Time
 Multi User Vs Single User
 Multi Tasking Vs Single tasking
 Distributed
 Embedded