Answer:
It explains why the seasons change
The seasons are caused as the Earth, tilted on its axis, travels in a loop around the Sun each year. Summer happens in the hemisphere tilted towards the Sun, and winter happens in the hemisphere tilted away from the Sun. As the Earth travels around the Sun, the hemisphere that is tilted towards or away from the Sun changes.
Our seasons change because Earth tilts on its axis, and the angle of tilt causes the Northern and Southern Hemispheres to trade places throughout the year in receiving the sun's light and warmth most directly.
It explains what happens if the seasons didn't change.
Possibly, without seasons, nothing would change at all. It would not impact our lives other than the weather being the same in one place while being completely different in the other for the whole year.
Everyone would probably move toward the locations near the Equator where it’d be warmest. This would cause overpopulation, the spread of diseases, and a lack of resources