why do donuts have holes

Donuts have holes to help them cook evenly. The hole in the center allows the dough to cook more quickly and evenly, which prevents the center from being undercooked while the outside is golden brown. Additionally, the hole also allows for an easier grip and better distribution of toppings or fillings. The origin of the hole in the donut is uncertain, but some believe it was to eliminate the doughy center of traditional fried cakes.