A real time process is a process that must respond to the events within a certain time period. A real time operating system is an operating system that can run real time processes successfully
Always provides responses (both periodic, time-initiated responses and input or interrupt driven responses) within a specified window of time. The time is determined by the time constant of the dynamic process. Example time constants for external processes are milliseconds for machining or electric power systems, seconds for flow processes, minutes for thermochemical compositions and weeks for social/economic processes.
