Which term is used to describe the day of June 21 at north pole in terms of daylight and darkness

Answer;

Summer solstice

Explanation; Summer solstice refers to the two moments during the year when the path of the Sun in the sky is farthest north in the Northern Hemisphere (June 20 or 21) or farthest south in the Southern Hemisphere (December 21 or 22). The summer solstice occurs at the moment when the earth's tilt toward from the sun is at a maximum. Therefore, on the day of the summer solstice, the sun appears at its highest elevation with a noontime position that changes very little for several days before and after the summer solstice.