Nanorobotics is an upcoming technology field of creating robots whose components are at or close to the microscopic scale of a nanometer. To be more precise, Nanorobotics is the nanotechnology technique of building and forming designs of nanorobots. These robots range in size from 0.1-10 mm and get built in nanoscale (molecular component). The names nanorobots, Nanobots, nanoids, nanites, nanomachines or Nano-mites have also been used to describe these devices currently under research and development. Nanorobots get widely employed in the research & development (R & D) phases, but some first molecular robots get tested. In an example, a sensor having switch approx 1.5 nanometers across is capable of counting specific molecules in a chemical sample. The most useful applications of Nanobots are said to be in medical technology, which is used to identify and destroy cancer cells. The other potential example is the detection of toxic chemicals, and the measurement of their concentrations, in today’s environment. The size of the Nanorobots is microscopic to be exact. Hence it is necessary for a large number of nanorobots to perform the microscopic and macroscopic tasks correctly together. These nanorobots move into large numbers i.e. swarms, both those incapable of carrying the replication and those capable of unconstrained reproduction in the natural environment.