A duvet and a comforter are very similar types of bedding, but they are not the same thing. A duvet and a comforter both contain a fill for warmth and can both be made of the same variety of fabrics. A duvet, however, includes a cover to allow for changing the design and making it easier to clean. Duvets also tend to be even warmer than comforters as they have those extra two layers of fabric.