In recent days, Nano technology is hottest career in the engineering stream, which means the science of miniature. If any matter reduced to its Nano dimension, then it starts showing very strong changes in its properties in which the changes includes changes in physical, chemical, magnetic, optical, mechanical and electrical properties. Now scientists are able to claim by their extensive research in Nano technology that if atoms in coal are reassembled, then diamonds can also be produced. The research analysis requires applications from various fields including Bio science, Medical Science, Environment, Electronics, Cosmetics, Security and other subject areas. Nano technology would be the platform to address all issues from medicine to aero space and from engineering to many industrial and technological areas. It is being said now that 21st century would be the century of Nano technology as it would change every field.