Question

what is the use of stopwatch

Answer 1

The use of stopwatch is used to measure time.

Answer 2

Stopwatch means by which we have control on time(not time but amount of time) or to know the amount of time, by this we can start or stop the time (not the time means not about the earth rotation or revolution).

For example there are two players running athletes, I want to know who will reach the finish line from starting line for first I need stopwatch.