Temporal symmetry refers to the idea that the laws of physics remain the same regardless of the direction of time. This means that processes in nature, such as the motion of objects or the behavior of particles, should theoretically work the same way whether time moves forward or backward. In practical terms, temporal symmetry suggests that if you could reverse time, the events would unfold in a similar manner. This concept is often discussed in relation to fundamental physics and is linked to theories involving time travel and thermodynamics, where the flow of time is a crucial factor in understanding physical phenomena.