Tradition.
However, like most traditions, there's an underlying reason for it. The hole probably originated as a way to make sure the donut got thoroughly cooked; frying a ball of dough tends to either overcook the outer layers or leave the middle raw. Poking a hole through the middle allowed the hot oil to pass through the center of the donut, cooking it more evenly.
Donuts without a hole in the middle are often referred to as "filled donuts" or "jelly donuts." These treats come with various fillings, such as jam, cream, or custard, and are typically coated in sugar or icing. Their absence of a hole distinguishes them from traditional ring-shaped donuts.
Donuts Lifesavers Bagels
a fried piece of bread (sometimes) with a hole in the middle
Becuz I can has cheezburger.
When they make the donuts they take out the middle and form it into a ball.
Injected into the donut from the hole in one end.
Donuts were made with holes because the additional surface area allows it to cook through much faster.
its like a shot or something they fill it with jelly and then ta da.
They are both forms of bread made from flour and baked.
No
Ask if they want to get a coffe at Dunkin Donuts.
A small ball with a hole in the middle is probably a Bead.