Nanotechnology involves engineering systems at the molecular scale between 1 to 100 nanometers. Dr. K. Eric Drexler popularized the term nanotechnology in the 1980s and described how nanomachines could manufacture products through molecular assembly. Nanotechnology is now an interdisciplinary field where scientists are experimenting with nanoscale substances to understand their unique properties and potential applications in areas like medicine, electronics, and materials. While offering many benefits, nanotechnology also presents challenges like ensuring the safety of nanoparticles and addressing ethical concerns about human enhancement and economic impacts.