Bed frames are a piece of furniture that serve as the base for a bed. They are designed to support the mattress, box spring, and any other bedding items, such as a comforter or sheets. Bed frames can be made out of a variety of materials, such as wood, metal, or plastic, and come in different styles, such as platform, sleigh, or canopy. They also come in different sizes, such as twin, full, queen, or king, to accommodate different mattress sizes. Bed frames can be purchased at furniture stores, home goods stores, and online retailers.