Spray cans, also known as aerosols, are containers that hold a variety of liquids or gases under pressure. They are used to dispense the contents in a fine mist or spray. Spray cans are often used for painting, cleaning, lubricating, and other applications. They are also used to apply insecticides, deodorants, and other products. The pressurized gas inside the can helps to propel the liquid or gas out of the nozzle.