This document provides an overview of nanorobotics and nanotechnology. It discusses how nanorobots are nanoscale robots typically between 0.5-3 microns in size. The document outlines early concepts for nanorobots from Richard Feynman in 1959 and describes current research focused on simulation and macroscopic manipulation. Potential applications of nanorobots discussed include medical uses like disease treatment and augmenting the immune system. Ongoing challenges in building nanorobots and nanites at the molecular level are also presented.