Speed of Light and Causality

The speed of light, approximately 299,792 kilometers per second, is the fastest speed at which information or matter can travel in the universe, according to Einstein's theory of Special Relativity. This limit ensures causality, meaning that cause and effect remain consistent; an effect cannot occur before its cause. If something could travel faster than light, it might allow information to be sent backward in time, disrupting our understanding of cause and effect. Thus, the speed of light acts as a universal speed limit, preserving the order of events in the universe.