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An embedded system is a one that has computer hardware with software embedded in it as one of its important components.Computer hardware like microprocessor, memory, input units, output units, network units are embedded systems.Components of an embedded system are hardware like processors, interrupt controller, memories, ports etc; it has main application software which may perform concurrently the series of tasks. It has real time operating systems which defines the system works. RTOS supervises the application software. It sets the rules during the application program. But a small scale embedded systems may not need RTOS.