What is an Operating System?

A computer is a combination of hardware and software. The hardware components of a computer include a monitor, a keyword, a power supply, hard drives, a motherboard, memory modules, processors, a system fan, and other devices. A computer may also have some external devices such as a printer, fax, and a hard drive. The software component of a computer is a set of software applications including the operating system that makes hardware talk to each other and tell them to do something such as print.

 In the desktop world, Microsoft Windows is the most installed operating system and controls 82% of desktops. Apple’s macOS is installed on 13% of computers. The rest of the 5% is shared among various operating systems including Linux.

According to global data collected by statcounter (image below), Android is the most popular operating system in the world with 40% of the world’s devices powered by Android. To be exact, Android, Windows, iOS, OS X, and Linux are the top 5 most popular operating systems in the world with 39.5%, 36.4%, 13.1%, 5.8%, and less than 1% respectively.

Windows


Windows is the second most popular operating system, and powers most of the PCs and laptops with 36% of the market share. iOS, OS X, and Linux are the other three most popular operating systems with market shares of 13%, 6%, and 1% respectively.

Windows, developed by Microsoft, is an operating system for PCs and powers over 1 billion devices. Currently, there are two major Windows OS versions, Windows and Windows Server.

The following table summarizes Windows OS versions and their release dates.

Release Year           Version

1983                            Initial launch

Bill Gates announced Microsoft Windows

1985                           Windows 1.0

Priced at $100.

1987                          Windows 2.0


1988                         Windows 286

Microsoft Windows 286 was introduced in June 1988. Priced at $100.

1990                         Windows 3.0

Full version of Microsoft Windows 3.0 was priced at $149.

1991                         Windows NT

Windows NT was introduced.

1991                        Windows 3.0a

Windows 3.0a with Multimedia was released.

1992                      Windows 3.1

Sold 1 million copies within months.

1992                     Windows for Workgroups

Windows for Workgroups 3.1 was released.

1993                     Windows NT 3.1


1993                   Over 25 million licenses were sold.

1995                    Windows NT 3.51


1995                    Windows 95

Windows 95 was released that become “the Windows”

1996                    Windows NT 4.0


1996                   Windows 95 (4.0)


1996                  Windows CE 1.0

Windows Compact Edition for devices.

1997                 Windows CE 2.0


1998               Windows 98


1999               Windows CE 3.0


2000               Windows 2000, Windows ME


2001                 Windows XP

One of the most popular Windows for home and individual users.

2003                 Windows Server 2003

Microsoft Windows Server 2003 was released.

2006                  Windows Vista

Was a major disaster.

2008                 Windows Server 2008


2009                Windows 7


2012               Windows Server 2012, Windows 8


2015                Windows 10

Windows 10 continues to improve.

Oct 2016          Windows Server 2016


Nov 2019         Windows Server 2019

Windows Server 2019 on-premises and Windows Server 2019 on Azure


Among all Windows versions, Windows 10 is the most popular with more than 55% of market share. Windows 7 is the next version that is used by 33% of users. 

Windows 10 OS Breakdown

Android



Android, originally developed by Android Inc., was later acquired by Google and is a Linux-based mobile and tablet operating system that powers more than 2 billion monthly active devices worldwide. Android not only powers mobile devices but also runs TVs, smart watches, cars, gaming consoles, digital cameras, and other electronics.

According to statcounter, Android took over Windows to become the world’s most popular operating system in April 2017.

  1. Android 1.5: Android Cupcake
  2. Android 1.6: Android Donut
  3. Android 2.0: Android Eclair
  4. Android 2.2: Android Froyo
  5. Android 2.3: Android Gingerbread
  6. Android 3.0: Android Honeycomb
  7. Android 4.0: Android Ice Cream Sandwich
  8. Android 4.1 to 4.3.1: Android Jelly Bean
  9. Android 4.4 to 4.4.4: Android KitKat
  10. Android 5.0 to 5.1.1: Android Lollipop
  11. Android 6.0 to 6.0.1: Android Marshmallow
  12. Android 7.0 to 7.1: Android Nougat
  13. Android 8.0 to Android 8.1: Android Oreo
  14. Android 9.0: Android Pie

iOS and macOS

iOS and macOS are two operating systems developed by Apple. The iOS operating system is for Apple’s mobile devices including iPhone and iPad.





Version                                           Release date

iPhone OS 1                                               Jan 2007

iPhone OS 2                                               July 2008

iPhone OS 3                                              March 2009

iOS 4                                                         March 2010

iOS 5                                                          June 2011

iOS 6                                                         June 2012

iOS 7                                                         June 2013

iOS 8                                                         June 2014

iOS 9                                                         June 2015

iOS 10                                                      June 2016

iOS 11                                                     June 2017

iOS 12                                                     June 2018


Linux



Linux is a clone of Unix, written from scratch by Linus Torvalds and released in 1991. Linux provides modern OS features, including true multitasking, virtual memory, shared libraries, demand loading, shared copy-on-write executables, proper memory management, and multistack networking including IPv4 and IPv6.

Although originally developed for 32-bit x86-based PCs (386 or higher), today Linux also runs on a multitude of other processor architectures, in both 32- and 64-bit variants.

Linux is one of the first and most successful community-driven, free and open-source software that has changed the way we build, distribute, and manage software. Linux is distributed under GNU/Linux license, which means any one can download, use, modify and distribute software.

Linux Kernel is the engine that runs all Linux based operating systems. Today, the Linux Kernel-based operating system powers billions of devices including servers, personal computers, embedded devices such as TV sets, wearables, automobiles, routers, gaming consoles, and smart appliances. Mobile devices, mainframes, and supercomputers run on Linux.

The most popular Linux Kernel-based operating systems are Ubuntu, Linux Mint, Debian, Fedona, RedHat/centOS and openSUSE.

The latest version of Linux kernel, Linux kernel 5.0, was just released. Some of the key features released in this version include AMD FreeSync display support, new console font for HiDPI/retina displays, Raspberry Pi Touchscreen support, Btrfs swap file support, Adiantum data encryption, and Logitech high-resolution scrolling.
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