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All computing devices work is impossible without a control program. These are the operating systems. Need a computer? It is a complex system consisting of a number of different special units called nodes, components. Operating systems for example converts AC mains voltage of 220 volts to a number of constants required for the operation of power supply components; Processes graphics card images and displays them on monitor screen;

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CPU calculations involved and so on. In other words, a combination of computer system hardware components, integrated into a single device. An integrated operating system is required for all units to work. An important point: one of them (subject to the length of the word, and other requirements) can be set on the computer. To simplify the understanding of the term "operating system", you can use a human analogy: computer hardware - his body; Control program - a set of reflexes with the nervous system and the brain; And the application program represented the ideas, intent, idea. - Reflexes - Body (action) Idea: Founded a team hierarchy. Of course, this explanation is true with reservations, but what allows for a description of operating systems "at the fingertips". In fact, they are a kind of buffer between program components and the user. No application can be performed outside the operating system. Even in the early days of computing, when in Windows, Linux, Mac OS work became possible thanks to DOS. Well this acronym stands for Disk Operating System.

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According to the working method, all such solutions can be divided into three groups: division, with batch employment, real-time. The first user interaction is the calculation of process performance in the authorized (or external terminals). Accordingly, the result changes. Time sharing requires multiple tasks to be executed, but with the rapid processor switching between them that creates the illusion of continuity. Interference is also possible. But batch processing is to make a list of jobs and send them to perform. Accurate data can only be in the interval between packets.

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Apple's operating system offers any operating system three types of interaction: between the user and the application programs and hardware components, data streams themselves. For Convenience Campaign has been created user-friendly graphical interface - system for intuitive set of images, icons, commands that work with man-generated commands (in automatic "transparent" mode). All modern solutions - namely graphics. These include Windows, the Linux family, and Apple's operating system. Work through۔ The command line is now often sold as a supplement. Exception - highly specialized devices.Since most people did not wonder how it works installed on the computer operating system, the choice is made first, for the convenience of using the interface. This language differs not only in appearance, but also. Thus, the Russian operating system is more popular in the former Soviet Union.