Yes, time dilation is a concept within the theory of relativity that relates to the measurement of time itself. Time dilation refers to the phenomenon where time appears to pass differently for objects or observers in relative motion.
According to the theory of special relativity, the passage of time is not absolute but depends on the relative motion between observers. When two observers are moving relative to each other at different velocities, they will measure different amounts of time passing between two events.
Time dilation occurs because the speed of light is constant in all inertial reference frames. As an object moves faster relative to another observer, time for that object appears to slow down from the perspective of the stationary observer. This means that clocks on the moving object would tick slower relative to the clocks of the stationary observer.
So, time dilation is a fundamental aspect of how time is experienced and measured in the theory of relativity. It recognizes that the perception of time passing can vary depending on the relative motion between observers and has been experimentally confirmed in numerous experiments and observations.