The document discusses several major operating systems: 1. Windows is one of the most popular systems in the market, covering about 90% of the market share. 2. Linux is a widely used open-source operating system based on the Unix system that was developed in 1969. 3. Google Chrome OS is based on the Linux kernel but uses Google's own window manager instead of commonly used ones like GNOME or KDE. Google plans for open-source community collaboration on the project.

1. OPERATING SYSTEMS

2. Index Introduction

3. Windows

4. Linux

5. Google chrome OS

6. Mac OS

7. Introduction : The OPERATING SYSTEM (OS) is the most important computer program in a computer, to work the other programs each computer must contain an Operating system , the Operating system performs the basic tasks for example: it sends the information to the screen, it controls peripheral devices such as printers ,scanners etc .

8. Some of the most used operating systems:  Microsoft windows :windows version appeared first in November 1985. It is one of the most popular systems in the market ,it covers about 90% of the market share .

9.  Linux : The unix operating system was conceived and implemented in 1969 at AT &T's Bell Laboratories in the USA by Ken thompson,Dennios Ritchie ,Duglas Mclroy and Joe Oassanna. The growing popularity of GNU / Linux is due, among other reasons, its stability, access to source code (which allows you to customize the operation and safety audit)