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Few drops of oil are poured on the hinges of a door, the door moves smoothly by reducing friction. Oil is a lubricant. it helps to reduce friction by being applied over the irregularities of a surface. So, there is no interlocking of irregularities, so, friction reduces, and the door moves smoothly.
In the machines, the flow of compressed and purified air lowers the friction, hence is acts as a lubricant
The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It achieves this by using at least two races to contain the balls and transmit the loads through the balls.
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