Nanotechnology (NT) is defined and introduced in Section 2.1. The still futuristic molecular NT with its associated concepts is discussed in Section 2.2. Section 2.3 describes the trend towards convergence of nano-, bio-, information and cognitive sciences and technology. Section 2.4 presents the areas of NT, and Sections 2.5 and 2.6 look briefly at R&D of NT and the expected market, respectively.