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Imagine that you are standing outside on a sunny day.
During the day, the sky is bright and the sun is shining.
But have you ever wondered what happens when the sun goes away?
At night, the sky becomes dark, and everything around us gets dim.
The Earth spins around itself, like a spinning top, and it takes 24 hours for it to make one complete turn.
During this rotation, different parts of the Earth face the sun at different times, creating day and night.
But when that part of the Earth turns away from the sun, it becomes night.
The darkness of night is not a bad thing.
Nighttime can also be a great time for stargazing.
So, day and night are like a cycle.