An air mattress is a type of inflatable bed that can be filled with air to provide a sleeping surface. They are often made from durable materials like PVC or vinyl and can be easily deflated for storage or transport. Air mattresses are popular for camping, guest accommodations, or temporary sleeping arrangements. These mattresses come in various sizes, including twin, full, queen, and king. Many models feature built-in pumps for easy inflation and deflation. Some air mattresses also have adjustable firmness levels, allowing users to customize their comfort while sleeping.