Why are the temperatures highest in the tropical zone?

Temperatures are highest in the tropical zone primarily due to the direct overhead sunlight that this region receives throughout the year. The Earth's tilt allows the sun's rays to strike the tropics more directly, resulting in higher solar radiation and consistent warmth. Additionally, the tropical zone has less seasonal variation, maintaining warm temperatures year-round. This combination of consistent sunlight and minimal seasonal change contributes to the high temperatures characteristic of the tropics.