The nanorobotics is the technology of the creating machines or the robots at or close to a scale of the  10-9metres[nanometre] nanorobots. The  nanobots or nanoids[nanorobots] are constructed of the nanoscale or the molecular components. At this time, as no artificial non-biological nanorobots have been created so far, they remain the hypothetical concept. This articles focuses on history of nanorobots, composition of nanorobots, mechanism of nanorobots & applications of nanorobots.