Here's why:

* Earth's Tilt: The Earth is tilted on its axis at approximately 23.5 degrees. This tilt causes different parts of the Earth to receive varying amounts of direct sunlight throughout the year.

* Polar Regions: The poles are located at the furthest points from the equator, meaning they are tilted furthest away from the sun. As a result, the sun's rays hit the poles at a very shallow angle, spreading the energy over a larger area and resulting in less direct sunlight.

* Seasons: The tilt also causes the poles to experience extreme variations in daylight hours throughout the year. During their respective summers, the poles receive more direct sunlight as they are tilted towards the sun, but during their winters, they experience nearly 24 hours of darkness.

Therefore, the poles experience the least direct sunlight because they are tilted furthest away from the sun and receive sunlight at a very shallow angle.