According to the theory of relativity, time dilation occurs when an object moves relative to another at speeds approaching the speed of light. In this case, time appears to run slower for the moving object as observed by a stationary observer. This phenomenon is known as time dilation.
So, if you are traveling near the speed of light relative to an observer, from your perspective, the observer's clock would appear to be ticking slower compared to your own clock. This effect arises due to the relative motion between the two frames of reference.
It's important to note that time dilation is reciprocal. From the perspective of the observer, your clock would also appear to be ticking slower than theirs. Both observers experience time dilation relative to each other.
This phenomenon is a consequence of the theory of relativity and has been experimentally verified in various ways, such as through high-speed particle accelerators and the synchronization of atomic clocks on moving vehicles.