A king bed is a large mattress size designed to provide ample space for couples or individuals who enjoy extra room while sleeping. Typically measuring 76 inches wide by 80 inches long, it offers more sleeping area than a queen bed, making it ideal for those who prefer a spacious sleeping environment. King beds come in various styles, including California king, which is slightly longer and narrower, measuring 72 inches wide by 84 inches long. These beds often require larger bedrooms to accommodate their size, and they are compatible with a range of bedding options, including sheets and comforters specifically designed for king-sized mattresses.