As the Earth travels around the sun, we experience different seasons. Because the Earth also rotates on its own axis, we experience day and night. However, the Earth is tilted on its axis by 23.4 degrees, meaning that one hemisphere is always closer to the sun than the other. This is why we have opposite seasons in the northern and southern hemispheres.
During summer in the northern hemisphere, the North Pole is tilted towards the sun. As the Earth turns, the Polar Region stays facing the sun, and the North Pole itself doesn’t experience darkness for six whole months. Arctic areas just south of the pole also experience the Midnight Sun, but for shorter lengths of time. The effect is diluted further south, and instead of the golden nights of the Arctic summer, places south of the Arctic Circle simply see longer days. Areas close to the Equator experience very little change in daylight hours between the seasons.
Once summer is over, the sun sets over the Polar Region for the first time in months. This sunset will send the North Pole into six months of darkness, while other parts of the Arctic will experience both day and night for some months, before entering Polar Night during the winter.