Why does Earth have day and night?

Explanation

**Step-by-Step Solution:**

1. **Understanding Earth's Motion**: The Earth has two main types of motion: rotational motion and revolutionary motion. Rotational motion refers to the Earth spinning on its own axis, while revolutionary motion refers to the Earth moving around the Sun in an orbit.

2. **Defining Rotation**: Earth's rotation occurs on an imaginary line called its axis, which runs from the North Pole to the South Pole. This rotation happens approximately every 24 hours.

3. **Sunlight and Day/Night Cycle**: As the Earth rotates, different parts of it face the Sun at different times. When a part of the Earth is facing the Sun, it experiences daylight because it receives sunlight. Conversely, the side of the Earth that is turned away from the Sun experiences nighttime because it is not receiving sunlight.

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