Nannometer is one-billionth of a meter which is smaller than wavelength of visible light and hundred thousandth the width of a human hair nature perfected the science of manufacturing matter molecularly for instance our body are assembled in a specific manner from million of living cells are nataure’s nanomachine in general nanotechnology dealing with any thing measuring between 1 and 100 nm larger than that is microscale and smaller than that of atomic scale nanowire and carbon nano tube scientists find 2 nano size structure of particular intrest- nanowire and carbonnanotube. Nano wire are the wire with a very small diameter some time as small as one nano meter. Scientists hope to use them to build tiny transistor for computer chips and other electronic devices