Nanotechnology is the manipulation, creation, and application of materials at the nanometer scale. A nanometer is incredibly small; for comparison, a single human hair is approximately 80,000-100,000 nanometers wide.
The unique aspect of nanotechnology is that the properties of many materials change at the nanoscale. These can be physical, chemical, or biological properties, and they often change in unpredictable and useful ways. Nanotechnology involves understanding these properties and effectively using them for various applications.