This assignment delves into the world of nano technology, a branch of science that deals with manipulation of matter on an atomic, molecular, and supramolecular scale. It highlights the importance of nano technology in reducing loss and uncertain risk factors, and its potential to enhance treatment efficiency. The assignment also discusses various applications of nano technology, including solar cells, fuel cells, batteries, space, and better air quality. Additionally, it explores the concept of nano adsorbent and carbon nanotubes as materials for water treatment.