Question

what is time dialation....explain​

Answer 1

Explanation:

Time dilation is a difference in the elapsed time measured by two clocks, either due to their having a velocity difference relative to each other, or by their being differently situated in a gravitational field. After compensating for varying signal delays due to the changing distance between an observer and a moving clock (i.e. Doppler effect), the observer will measure the moving clock as ticking slower than a clock that is at rest in the observer's own reference frame. A clock that is close to a massive body (and which therefore is at lower gravitational potential) will record less elapsed time than a clock situated further from the said massive body (and which is at a higher gravitational potential).

These predictions of the theory of relativity have been repeatedly confirmed by experiment, and they are of practical concern, for instance in the operation of satellite navigation systems such as GPS and Galileo.[1][2] Time dilation has also been the subject of science fiction works, as it technically provides the means for forward time travel.[3]