Nanotechnology is a type of science and technology that deals with very small things. It is a way of creating really tiny objects and materials. Energy applications of nanotechnology are a way of using nanotechnology to create new kinds of energy-related technologies. For example, engineers could use nanotechnology to create tiny devices that can capture energy from the sun or to make batteries that store more energy. They could also make more efficient ways to store and use energy, like special materials that store electricity better. Nanotechnology could also be used to create materials that are better at insulating from heat or to create lighter, more efficient electric vehicles. All of these applications of nanotechnology can help us in our efforts to create cleaner and more efficient sources of energy.