Multiple OS

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An Operating System is the low-level software which manages a computer. It takes care of how the hardware behaves, the communication with peripherals such as a monitor, a printer or a keyboard, the allocation of memory between all the applications, as well as the prioritization of apps in case multiple ones run simultaneously. Each program which is installed on a laptop or a desktop operates by sending requests to the OS for different services via an application program interface (API). The contact with the OS can be done via a Graphical User Interface (GUI) or a command line. In the Internet hosting field, the OS is what runs a web hosting server together with all the software installed on it, which includes not only website scripts, but, in addition any other application for instance a VOIP or a game server. When there are virtual machines created, they employ a guest OS which is run on the server host OS.