The summer solstice takes place when the northern side of the earth is tilted towards the sun. This will cause summer to take place in the northern hemisphere. Since the southern hemisphere is not getting enough sun, it will be winter there. The summer solstice is essential because it is essential for people to experience the different seasons.
For other people, the summer solstice signifies some changes that they will do in their lives. Summer usually makes people more joyful. It gives them a chance and the opportunity to do more, and this makes the day unique for them. Take note that the distance of the earth from the sun does nothing with the changes that will be experienced by the earth.
The summer solstice stands to reason as the hottest day of the year. It often falls around June 21 or June 22. It marks the day which the Sun is at its highest point. It also marks the beginning of summer. This happens because the North Pole tilts towards the Sun causing the beginning of summer in the Northern Hemisphere.
The opposite happens in the Southern Hemisphere, the sun is at its lowest point and it is winter as the Southern pole is tilted away from the sun. Hope you find this helpful.