It is used as a second sheet changing your bedroom decoration easier, because just by changing your duvet cover, it already gives different look on your room.
Duvet covers usually have one end that has a zipper or buttons that can seal the duvet cover around the comforter. Duvet covers fit tightly around duvets and protect them from getting dirty or soiled.
One of the reasons why people use duvet cover, is because it would be easier to clean your duvet cover instead of your own comforter, especially if the bed comforter is made from feather (you need special method to wash this kind of comforter).
Duvet covers has variety of sizes, but the difference usually just 8-10 inches. Comparing the actual size of your comforter would be wise thing to do before buying a new duvet cover, make sure you don't buy something that in the end you can't use. You must pay attention to the fabric type, silk, plyester cotton blend, or 100% cotton ? The higher the quality means that your duvet cover will last longer.
Duvet covers are made from different kind of patterns, you can choose fabric styles, solid colors, patterned, etc. This little changes can change the whole look of your bedroom. The best part is you can wash duvet cover just like a cleaning sheets, put them in the washer and dryer as needed. Since duvet cover resides on top of the bed, you don't have to wash your comforter