A duvet cover is simular to a pillowcase and it is used to protect your down comforter. Down comforters often cannot be washed, so a duvet cover is used to protect your comforter - then when the duvert cover gets dirty, you remove it from your comforter and throw it in the wash. Many people use duvet covers just to change the colors of their bedroom and have several duvert covers that they change out throughout the year. Click here to see some examples of Duvet Covers. The Country Cabinet = Your complete Bedding, Bath and More Store