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signal is a form of interprocess communication .It is an asynchronous noticification sent to a process or specific thread.when a signal is sent the operating system interrupt the target process's normal flow of execution.
- kumarahul120292 February 15, 2013Interrupt is a signal that is generated by hardware or software that need 's immediate attention . an inetrrupt alert the processor to a high priority condition requiring the interruption of the current code that processor is executing .then processor responds by suspending it's current activity and execute a small program called interrupt handler to deal that event .