What is the reason for the formation of polar days and nights?

The polar day and night are formed due to the tilt of our planet ~ 22% from the equator. Here the equator refers to the line passing through the center of the Earth. Since the Earth rotates around its axis, the change of day and night takes place in 24 hours in ordinary places, and at the poles there is a day for half a year, then night. Days and nights at the poles sometimes reach 180 days.