Compressed air is generally used as a power source and is widely used.

Drive the cylinder to produce linear motion; drive the pneumatic motor to produce rotating motion; drive the jet element to perform operation and control.

Use it to carry some material and finish the work. For example, sandblasting; spray; spray cleaning; spray paint.

Using its compressibility, cushioning and spring action. Gas springs; cushions and so on.

And the derived application above. For example, cylinders can be derived from air bags, air pads, etc.