This lecture explores the functional properties of materials at the nanoscale, delving into the manipulation of light, quantum mechanics, nanofabrication techniques, and applications like LED screens with nanoparticles. It covers topics such as quantum confinement, luminescence, color properties, and the potential of metallic nanoparticles. The instructor showcases tools like electron microscopy and tunneling microscopes, emphasizing the transition from macroscopic to nanoscopic properties. The lecture also discusses the impact of nanotechnology on various fields, from biomedicine to catalysis, and highlights the significance of quantum dots in emerging technologies.