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Essay 5   
Operating system
          I’m going to explain the basics off an operating system. This is an interface between a computer user and hardware.It is very important as it works as a middleman making sure both hardware and software correctly.Operating systems provide a software platform on top of which other programs called application programs, can run. The application programs must be written to run on top of a particular operating system. Your choice of operating system, therefore, determines to a great extent the applications you can run. For PCs, the most popular operating systems are DOS, OS/2 and Windows, but others are availbale, such as Linux.
     First, The basic unit of software that the operating system deals with in scheduling the work done by the processor is either a process or a thread ,depending on the operating system.It is processes rather than applications, that the operating system controls and schedules for execution by the CPU. In a single –tasking system, the schedule is straight forward.The operating system allows the application to begin running, suspending the execudion only long enough to deal with internepts          and user input process management is an integral part of any modern day operating system the OS must allocate resources the processes, enable processes to share and exchange information product the resources of each process from other processes and enable synchronization among process. To meet these requirement is the as must  mountain a data structure for each process, which describes the state and resource ownership of that process, and which enables the OS to exert  control over each process.
     Next, Popular operating systems
     The three most popular types of operating systems for personal and businesses computing include      Linux, windows and Mac
·                             Linux operating systems
     Linux is a freely distributed open source operating system that runs on a number of hardware              platforms. The Linux kernel was developed mainly by Linus Torvalds and it is based on Unix.
·                              Mac Operating Systems
    Mac OS is official name of the Apple Macintosh operating system. Mac OS features a graphical         user interface (GUI) that utilizies windows, icons and all applications that run on a Macintosh             computer have a similar user interface.
·         Windows operating system
Microsoft Windows is a family of operating systems for personal and business computers. Windows dominates the personal computer world, offering a graphical user interface (GUI), virtual memory management, multitasking and support many peripheral devices
Then, There are four  essential managers of every OS and they all work together like team to get jobs completed. An operating system is simple term it’s chief program that manages all of the hardware and software . It is works as their bass and makes sure they are all working in harmony.

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