Why are the places in the Torrid Zone hotter than those in other zones?

The Torrid zone or the tropical zones lie between the Tropic of cancer and Tropic of Capricorn which mark the limit of the overhead Sun to North and South of the Equator, i.e., 23 1/2°N to 23 1/2°S. This area receives direct sun rays and therefore, the places in the Torrid Zone are hotter than those in other zones.