Nanotechnology Applications

Discuss current or future applications of nanotechnology in fields such as medicine, engineering, space exploration, fuel cell development, air and water purification, and agriculture.
Provide at least three examples of real-world applications in use or in development with reliable references.
it is the technology and science of building devices for example electronic circuit that is from single molecule and atom
it is any fabrication technology that object are built and designed by the placement and specification of individual molecules or atom.