What is difference between Campfire and Bonfire?

That cooking thing's not necessarily true. I have definitely roasted marshmellows at bonfires. But bonfires are larger, therefore, hotter, and you do not stand next to them for very long. They light a larger area and are used at large outdoor parties that are expected to go late into the night, if not last the whole night. No one really sleeps at a bonfire. It is an event. While campfires are made for camping. Usually temporary, campfires are used for warmth and cooking, then put out for the night to sleep.

Campfires' use is practical.
Bonfires' use is for entertainment.