A "floor" is the lower surface of a room or building where people walk. It can be made from various materials, such as wood, tile, carpet, or concrete. Floors provide stability and support for furniture and other objects placed on them. In buildings, floors are often organized into levels, such as the ground floor, first floor, and so on. Each level may have its own unique design and purpose. Floors can also be found in outdoor areas, like patios or decks, which serve as surfaces for activities and gatherings.