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"Nano' is something which is smaller than the atomic level of anything. Nanotechnology is the study of matter manipulating scales. It is the construction of any functional level or ways level. Very can say atomic. A Nano is one billionth of a meter.In nanotechnology, products are created with building blocks at length scale less than hundred nanometres.Nanoscience is the most fundamental aspect of phenomenological study at length scale less than hundred nano meter.Nanoelectronics is the most commercial manifestation of nano science and nanotechnology.