Nanotechnology refers to the science and technology of building devices, such as electronic circuits, from single atoms and molecules.The term nanotechnology  been used more broadly to refer to techniques that produce or measure features less than 100 nanometers in size; this meaning embraces advanced microfabrication and metrology.

According to Britannica Concise Encyclopedia nanotechnogy is,

Manipulation of atoms, molecules, and materials to form structures on the scale of nanometres (billionths of a metre). These nanostructures typically exhibit new properties or behaviours due to quantum mechanics. In 1959 Richard Feynman first pointed out some potential quantum benefits of miniaturization. A major advancement was the invention of molecular-beam epitaxy by Alfred Cho and John Arthur at Bell Laboratories in 1968 and its development in the 1970s, which enabled the controlled deposition of single atomic layers. Scientists have made some progress at building devices, including computer components, at nanoscales. Faster progress has occurred in the incorporation of nanomaterials in other products, such as stain-resistant coatings for clothes and invisible sunscreens.

According to wikipedia,

Nanotechnology,is the study of the control of matter on an atomic and molecular scale. Generally nanotechnology deals with structures of the size 100 nanometers or smaller, and involves developing materials or devices within that size. Nanotechnology is very diverse, ranging from novel extensions of conventional device physics, to completely new approaches based upon molecular self-assembly, to developing new materials with dimensions on the nanoscale, even to speculation on whether we can directly control matter on the atomic scale.

The U.S. National Science Foundation defines it as: "Research and technology development in the length scale of approximately 1 to 100 nanometers." By this loose definition, some types of nanotechnology exist already, producing specialized materials and components including powders, films, and chemicals. Not spectacular, perhaps, but attractive to investors because many products will be improved significantly.

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