Why do bagels have holes?

When you eat a bagel...
Have you ever wondered why there is a hole in the middle?
Why is there a hole?

It's just for the purpose of cooking them evenly.
They were made without the hole waaay back in the day and
found that the center wouldn't cook all the way and
would be doughy... so they made them with holes.
It also became easier for the bakers to transport them to trays
for cooking and delivering them as well.