The document discusses several major operating systems: - Microsoft Windows, developed by Microsoft, is one of the most widely used operating systems for personal computers. - Linux is an open-source Unix-like operating system assembled under a free and open-source software model, with several popular distributions like Ubuntu. - BSD/OS was an operating system based on Research Unix with a reputation for server reliability; it's descendants include FreeBSD, OpenBSD, and NetBSD.

1. By
Nitish Kumar P

2.  An operating system is the most important piece of software that runs on a
computer. It manages the computer’s computational activities associated with
the hardware and provides services for application-level programs. Functions of
an operating system include resource allocation, file system management,
memory management, and security.
2

3. 3
Microsoft Windows
Linux
BSD/OS
Android
Apple iOS
Mac OS
Harmony OS
Oxygen OS

4.  Microsoft Windows is a series of graphical interface operating systems
developed, marketed, and sold by Microsoft.
 Microsoft Corporation is an American multinational technology company with
headquarters in Redmond, Washington. It develops, manufactures, licenses,
supports, and sells computer software, consumer electronics, personal
computers, and related services.
 Microsoft Products
4

5.  Linux is a Unix –like computer operating system assembled under the model of
free and open source software
 Linux is a family of open-source Unix-like operating systems based on the
Linux kernel ,an operating system kernel first released on September 17,
1991, by Linus Torvalds . Linux is typically packaged in a Linux distribution.
 Linux Products
5

6.  Berkeley Software Distribution (BSD)/OS had a reputation for reliability in
server roles; the renowned Unix programmer and author W.Richard Stevens
used it for his own personal webserver.
 The Berkeley Software Distribution (BSD) is a discontinued operating system
based on Research Unix, developed and distributed by the Computer Systems
Research Group (CSRG) at the University of California, Berkeley. The term
"BSD" commonly refers to its descendants, including FreeBSD, Open BSD, Net
BSD, and Dragon Fly BSD.
 BSD/OS Products
6

7.  Android is a Linux-based operating system designed primarily for touchscreen
mobile devices such as smartphones and tablet computers. Initially developed
by Android Inc.
 Android is a mobile operating system based on a modified version of the Linux
kernel and other open source software, designed primarily for touchscreen
mobile devices such as smartphones and tablets.
 Android is developed by a consortium of developers known as the Open
Handset Alliance and commercially sponsored by Google. It was unveiled in
November 2007, with the first commercial Android device launched in
September 2008
 It is free and open source software
 Android Products
7

8.  iOS is a mobile operating system developed and distributed by Apple Inc.
 Originally unveiled in2007 for iPhone, it has extended other apple devices
such as iPod, iPad.
 OS is a mobile operating system created and developed by Apple Inc.
exclusively for its hardware.
 It is the operating system that powers many of the company's mobile devices,
including the iPhone and iPod Touch
 It also powered the iPad until the introduction of iPadOS, a derivative of iOS,
in 2019. It is the world's second-most widely installed mobile operating
system, after Android. It is the basis for three other operating systems made
by Apple
 Apple Products
8

9.  Macintosh Operating Systems (Mac OS) is a series of graphical user interface
based operating systems developed by Apple Inc. for their Macintosh.
 The family of Macintosh operating systems developed by Apple Inc. includes
the graphical user interface-based operating systems it has designed for use
with its Macintosh series of personal computers since 1984, as well as the
related system software it once created for compatible third-party systems
 Mac OS Products
9

10. 10