This document discusses nanotechnology and its applications. It begins by defining nanotechnology as the manipulation of matter at the nanoscale, which is one billionth of a meter. It then outlines several applications of nanotechnology including in electronics like transistors and solar cells, energy like batteries and fuel cells, and materials like carbon nanotubes. The document also discusses advantages such as stronger and lighter materials, faster computers, and medical applications like universal immunity. However, it notes some disadvantages like potential job loss and health risks from carbon nanotubes. Finally, it discusses the future of nanotechnology in areas like electronic paper and contact lenses.