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Laptops, tablets, and desktop computers all run operating systems that you've probably heard of. 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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Process management: it has its code , data, a certiain set of resources allocated to it  an one or more threads of execution through the code .
Memory management: memory must be shared between the OS and an application program. The OS must manage the allocation of memory to process and control the memory management hardware that determinates  what memory locations a process may access.

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An oprative system is the main software or set of programs of a computer that manages hardware resources and provides services to software applications programs.