The term real-time data is related to the fact that the data is evaluated and calculated in real time, i.e. immediately after it has been collected and without any noticeable delay. There must be no major latency in the evaluation and processing of real-time data.
Other explanations of real-time data define a time window in which the data must be available to the user. Since corresponding time windows are system-dependent, each real-time system would have a different real-time. There is no exact specification of the time delay that may occur during the processing of real-time data.
The provision and preparation of real-time data is significantly shortened by the available computing power and processing capabilities, which contributes to the reduction of delay times. In addition, there are physical limits, such as the propagation speed of electrical, optical or radio signals, which cannot be undershot and must be included in the consideration.