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Some examples include versions of Microsoft Windows (like Windows 10, Windows 8, Windows 7, Windows Vista, and Windows XP), Apple's macOS (formerly OS X), Chrome OS, BlackBerry Tablet OS, and flavors of the open source operating system Linux.

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It is the main software or set of programs of a computer system that manages the hardware resources and provides services to the software application programs, running in privileged mode with respect to the remaining

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Operating System Concepts: What is an OS (Definition)

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-Shell – it is the outer part of an operating system and it is responsible of interacting with the operating system
-Kernel – Responsible for managing and controlling computer resources such as the processor, main memory, storage devices, input devices, output devices and communication devices

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-The processor
-Main memory
-Input/Output Device
-Secondary storage devices
-Communication devices and ports

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An operating system has three main functions: (1) manage the computer's resources, such as the central processing unit, memory, disk drives, and printers, (2) establish a user interface, and (3) execute and provide services for applications software