The operating system has a systematic scheduling includes memory usage calculation, data processing, data storage, and other resources.
For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between application programs and the computer hardware,
although the application code is usually executed directly by the hardware and will frequently call the OS or lost by it. Operating systems are found on almost any device that contains a computer-from cell phones and video game consoles to supercomputers and web servers.
Examples of modern operating systems are Linux, Android, iOS, Mac OS X, and Microsoft Windows.
This sitem some screenshots of the current operation