Inflatable refers to something that can be inflated or filled with air, gas, or liquid to increase its size and change its shape. This term is commonly used for objects such as balloons, swimming pools, rafts, and air mattresses which are made from flexible materials like rubber or plastic that can be easily expanded by adding pressure. Inflatable structures may also refer to temporary buildings or shelters that are designed to be quickly assembled using lightweight materials such as fabric or vinyl coated nylon, and then filled with air for stability.