What is the difference between a duvet and a comforter?

Sweetie there is no difference at all they are the same thing but some People call them Duvets and some Comforter Here they are Duvets and always have been and then you get the Duvet Cover which is what goes over the Duvet

The duvet is the European name for a comforter. A duvet is usually filled with goose feathers or duck feathers and down. A comforter can have either natural or synthetic material while a duvet is usually filled with natural, the best being with eider down, and is better at keeping you warm since the air flows through the feathers whereas a synthetic comforter is not as good as it blocks the air flow. Duvets, the best ones are very expensive, but worth it.

I think that a duvet and a comforter are the same things. I also think that a quilt is a duvet and a comforter,too. But, honestly I am not exactly certain of the meanings of these words. ;)