Nanotechnology is the science, engineering, and application of structures, devices, and systems by manipulating atoms and molecules at the nanoscale (typically 1–100 nm). Fundamental concepts in nanotechnology include nanoscale materials such as nanoparticles, nanotubes, and nanowires, as well as techniques for their synthesis, characterization, and manipulation. This chapter delves into the different types of nanoscale materials, including nanoparticles, nanowires, and carbon-based structures like nanotubes and graphene, highlighting their distinct characteristics at this scale. Nanotechnology has broad applications across various fields, including medicine, electronics, energy, and environmental protection, enabling the development of innovative products such as targeted drug delivery systems, energy-efficient devices, and pollution control technologies. In medicine, nanocarriers such as micelles help in targeted drug delivery with reduced side effects. In electronics, carbon nanotube transistors allow for improvements in terms of size and speed. Other advancements in nanomaterial design and construction may require an approach that integrates knowledge from areas like nanotechnology, materials science, and engineering. This chapter further examines the interdisciplinary nature of nanotechnology, encompassing areas such as physics, chemistry, biology, and engineering, and illustrates its potential in diverse sectors, from medicine and electronics to energy and environmental sustainability. By understanding these foundational concepts, readers gain insight into the transformative potential of nanotechnology and its implications for future innovations.