The general mechanism of an air compressor is a piston or rotary component (e.g. rotary screw or vane) that draws in air, which is compressed into a storage tank. Naturally, since the piston 
or rotary component needs to move consistently and smoothly because of this to function, it generally needs to be lubricated.
In a lubricated air compressor, there is lubricating oil which keeps the piston or rotary component running well without damaging the system. The lubricant also really helps to dissipate Water Lubricated Air Compressor temperature and keep maintaining air compression efficiency.
Oil-totally free air compressors also use a piston or rotary element, but they bypass the lubrication problem by coating the compression element with a pre-lubricating material like Teflon. Some oil-free compressors may also use water instead of essential oil for the lubricating and cooling procedure. These alternate materials shield the pump and allow the mechanism to move smoothly without the need for any oil-centered or synthetic lubrication.