Simultaneity and Time Order

In the context of Special Relativity, simultaneity refers to whether two events occur at the same time. However, time order can vary depending on the observer's relative motion. Imagine two lightning strikes hit at different locations. An observer at one location may see the strikes as simultaneous, while an observer moving relative to them might see one strike happening before the other. This illustrates that time is not absolute; it can differ for observers in different frames of reference, fundamentally altering our understanding of how events are related in time.