How is time related to light in the theory of relativity?

In the theory of relativity, time is related to light through the concept of time dilation. According to this theory, time slows down for objects that are moving at speeds close to the speed of light. This means that as an object moves faster, time for that object appears to pass more slowly compared to a stationary observer. This relationship between time and light is a fundamental aspect of Einstein's theory of relativity.