This document provides an introduction to operating systems. It defines an operating system as software that enables all computer programs to function and acts as an interface between programs and hardware. The document then lists and describes the main functions of operating systems, including controlling memory allocation, prioritizing requests, managing input/output devices, and more. Finally, it distinguishes between single-user systems that support one user at a time and multi-user systems that enable regulated access for multiple simultaneous users through user accounts and databases.

1. SHUBHAM KUMAR JHA
SYIF 2nd shift
Bharati vidyapeeth institute of technology.
EmailID:Shubham.s.jha98@gmail.com
Subject: Operating Systems (For EDUSA)
Subject:- ppo

2. Contents
 Today's Topic: Introduction to Operating Systems
 We will learn
1. What is Operating System?
2. What OS does?
3. Structure of OS
4. Evolution of OS
 Batch Processing, Multiprogramming, Time
sharing systems
5. Operating System Functions
6. Main Funtions of OS
7. Types of OS
 Single User, Multi User systems

3. What is OS?
 Operating System is a software, which makes a
computer to actually work.
 It is the software the enables all the programs we use.
 The OS organizes and controls the hardware.
 OS acts as an interface between the application
programs and the machine hardware.
 Examples: Windows, Linux, Unix and Mac OS, etc.,

4. What OS does?
An operating system performs basic tasks such as,
 controlling and allocating memory,
 prioritizing system requests,
 controlling input and output devices,
 facilitating networking and
 managing file systems.

5. Structure of Operating System:
Application Programs
System Programs
Software (Operating System)
HARDWARE
(Contd…)

6. Operating Systems functions:
 The main functions of operating systems are:
1. Program creation
2. Program execution
3. Input/Output operations
4. Error detection
5. Resource allocation
6. Accounting
7. protection

7. Types of OS:
Operating System can also be classified as,-
 Single User Systems
 Multi User Systems

8. Single User Systems:
 Provides a platform for only one user at a
time.
 They are popularly associated with Desk Top
operating system which run on standalone
systems where no user accounts are
required.
 Example: DOS

9. Multi-User Systems:
 Provides regulated access for a number of users by
maintaining a database of known users.
 Refers to computer systems that support two or more
simultaneous users.
 Another term for multi-user is time sharing.
 Ex: All mainframes and are multi-user systems.
 Example: Unix

10. Thank You!!