Pneumatic devices are tools and machines that use compressed air to perform work. They operate on the principle of converting air pressure into mechanical energy, allowing for various applications such as lifting, moving, and shaping materials. Common examples include air compressors, pneumatic drills, and pneumatic cylinders. These devices are widely used in industries like manufacturing and construction due to their efficiency and power. Pneumatic systems are often preferred for their simplicity, reliability, and ability to operate in hazardous environments where electric devices may pose risks.