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A real tym os is one in which time constraint is specified between operation of processer and flow of data....means if u wana write code for rtos then u must be sure of that ur scheduling scheme wont exceed the time limit.

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G An Operating System is a low level program that runs on a processor and responsible for process scheduling, handling data and interfacing processor among many other peripheral devices.
Whereas A RTOS (Real Time Operating System) is a system that allows one to specify constraints on the rate of process and which guarantees that these constraints will be met. A RTOS supports real time systems to accomplish and achieve their goal by fulfilling the conditions of real time systems.