Nanotechnology and Picotechnology represent groundbreaking advancements in science and engineering, enabling manipulation at atomic and molecular scales. Nanotechnology, which deals with structures between 1 and 100 nm, has revolutionized fields like medicine, electronics, and materials science. Applications include targeted drug delivery systems, nanosensors, and nanoelectronics, which enhance efficiency and precision beyond traditional technologies. In medicine, nanotechnology enables early disease detection and personalized treatments through nanoparticles that interact directly with cellular structures. Similarly, nanomaterials are engineered to exhibit superior strength, conductivity, or reactivity compared to their bulk counterparts, leading to innovations in lightweight composites, energy storage devices, and environmental remediation. Picotechnology, a more speculative and advanced concept, extends the scale of manipulation to picometers (10−12 m), targeting individual subatomic particles. Although practical applications are still largely theoretical, it offers potential for unprecedented precision in atomic assembly and quantum level control. Research in Picotechnology could transform computing, leading to devices with nearly limitless processing power by utilizing the quantum properties of matter. Together, these technologies promise profound impacts across industries. They challenge traditional manufacturing paradigms by building materials and systems from the bottom up, atom by atom. Despite their vast potential, both fields raise significant ethical, safety, and regulatory concerns. Nanotoxicity, environmental impact, and responsible development highlight the need for careful governance and public dialog. This present chapter deals with an introduction to Nanotechnology and Picotechnology.