An air mattress is an inflatable bed made from durable materials like PVC or rubber. It can be easily inflated and deflated, making it convenient for temporary sleeping arrangements, camping, or guests. Air mattresses come in various sizes, including twin, full, queen, and king, and often feature built-in pumps for quick setup. These mattresses provide adjustable firmness by allowing users to control the amount of air inside. While they are portable and lightweight, air mattresses may not offer the same level of support and comfort as traditional innerspring mattresses or memory foam mattresses. Proper care can extend their lifespan.