A King mattress is a large bed size designed to provide ample space for couples or individuals who enjoy extra room while sleeping. It typically measures 76 inches wide by 80 inches long, making it one of the largest standard mattress sizes available. This size is ideal for those who may share their bed with pets or children, as it offers plenty of sleeping area. King mattresses come in various types, including memory foam, innerspring, and latex, catering to different comfort preferences. They are often paired with a compatible King bed frame to ensure proper support and stability. Due to their size, King mattresses may require larger bedrooms to accommodate them comfortably.