Matelasse Set: The main piece of the set is a matelasse (pattern appears quilted or padded). Comforter/Comforter Set: A comforter is the main bed covering featured in the bedding ensemble/ bedding kit. Duvet Set: A duvet cover is the main bed covering featured in the bedding ensemble/ bedding set Bed-in-a-Bag: Set is a “Bed-In-A-Bag” or the product comes in a prepackaged set. A Bed-In-A-Bag is a pre-assembled set that typically includes at minimum Comforter, Bed Skirt, Sham, etc. Quilt/Coverlet Set: A quilt, coverlet, or "bedspread" is the main bed covering featured in a bedding ensemble / bedding set kit. Daybed Set: Bedding ensemble / bedding set is for daybeds. Futon Cover Set: Bedding ensemble set is for a futon.