A nano machine is any mechanical device whose dimensions are on the order of one nanometer. This is typically smaller than the width of a human hair, and much too small to be seen with the naked eye. Nano machines are often used in research and development due to their unique size and properties.
Nano machines have many potential applications, including in medicine, manufacturing, and environmental cleanup. In medicine, nano machines could be used to deliver drugs directly to cells or to repair damaged tissue. In manufacturing, nano machines could be used to create incredibly precise products with very little waste. And in environmental cleanup, nano machines could be used to remove contaminants from water or soil without harming the surrounding ecosystem.
The field of nano machining is still in its infancy, but there is great potential for these tiny devices to revolutionize many industries.