Why do we have the nighttime when its dark and we cannot see the sun?

Nighttime occurs because the Earth rotates on its axis, causing different parts of the planet to face away from the sun. When a location is turned away from the sun, it experiences darkness, while the side facing the sun is illuminated. This cycle of day and night is a natural result of Earth's rotation and its position relative to the sun. During nighttime, we cannot see the sun directly, but it is still providing light to the other side of the planet.