why is the equator region the hottest part of the earth’s surface?

Answer 1

From Google.
"Since the Earth is tilted at its axis, the poles do not consistently receive the same amount of sunlight throughout the year. ... Therefore, it is hotter at the equator than at the North Pole because the sun's heat is concentrated directly overhead at the equator. The higher the sun in the sky (angle) the warmer it is."