Not necessarily but Yes, you can use a duvet cover on a comforter. Comforter is ready to use bedding accessory, immediately after purchase without covering but sometimes people cover because it protects your comforter from getting dirty. Covering a comforter with a duvet cover can make your bedding more soft and smooth. if you are confused with can a duvet cover be used on a comforter... https://www.aanyalinen.com/blogs/aanya-blog/can-a-duvet-cover-be-used-on-comforter