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The version of a popular desktop OS that was released in 2009, but is still in use today despite the availability of newer versions is "windows 7".

What is operating system (OS)?

An operating system (OS) is the software that controls all the other software applications in a computer after being loaded into the computer by the a boot program.

Some characteristics of operating system are-

  • The application programs interact with the operating system by requesting services via a predefined application programming (API).
  • Furthermore, users can communicate directly with the operating system via an interface, like a command-line interface (CLI) or even a graphical user interface (UI) (GUI).
  • The operating system (OS) of your computer oversees all of the software and hardware on the machine.
  • Most of the time, multiple computer programs are running concurrently, and they all require access to your central processing unit (CPU), memory, or storage.

To know more about operating system, here

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Universidad de Mexico