A computer is a set of resources for the movement, storage, and processing of data and for the control of these functions.The OS is responsible for managing resources like mouse ,printer ,memory ,etc.OS provides instructions for the processor.it is a program or suite of programs executed by the processor.
The OS frequently relinquishes control and must depend on the processor to allow it to regain control.The OS directs the processor in the use of the other system resources and in the timing of its execution of other programs.
Fig shows the main resources that are managed by the OS.A portion of the OS is in main memory.This includes the kernel, or nucleus, which contains the most frequently used functions in the OS and, at a given time, other portions of the OS currently in use.The allocation of this resource (main memory) is controlled by the OS and memory management hardware in the processor.The processor itself is a resource, and the OS determines how much processor time is to be devoted to the execution of a particular user program..
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