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Android operating system
It is an operating system affiliated with Google,
announced in 2007. Android is one of the most
widely used operating systems in modern smart
devices, due to its ease of design and handling.
It also provides the ability to download free and
paid applications in order to provide the user
with the ability to control the contents he uses
in His smart device.

There are other operating systems such as UNIX, OS/2
Modern operating systems, such as UNIX and OS/2, and application programs use
the graphical user interface, which makes using the computer easy. It displays
windows and drop-down menus, and allows the user to interact with the
computer by pressing and moving the mouse buttons to execute previously
prepared commands in the form of Icons.
Stages of development of the Windows operating system (Windows)
Microsoft founder Bill Gates announced the first Windows system in the
company's history on November 20, 1985. This system has achieved many
tremendous successes and is now the king on the throne of computer operating
systems.
The following is a presentation of the stages of development of the Windows
operating system from the first version of Windows 1.0 until its latest version 11
in 2022.

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