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Operating Systems
An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs.
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Types of Operating Systems
https://www.geeksforgeeks.org/types-of-operating-systems/
https://techspirited.com/different-types-of-operating-systems
Purpose of Operating Systems
An operating system is the level of programming that lets you do things with your computer. The operating system interacts with a computer's hardware on a basic level, transmitting your commands into language the hardware can interpret. The OS acts as a platform for all other applications on your machine. Without it, your computer would just be a paperweight. (read more below)
https://computer.howstuffworks.com/macs/mac-os-x1.htm
https://www.desktopclass.com/computer-it/what-is-the-purpose-of-operating-system.html