Nanotechnology is a part of science and technology about the control of matter on the atomic and molecular scale - this means things that are about 100 nanometres across

Nanotechnology includes making products that use parts this small, such as electronic devices, catalysts, sensors, etc. To give you an idea of how small that is, there are more nanometres in an inch than there are inches in 400 miles.

Typical nanostructure geometries.