Science Fiction has spawned plenty of fictional gadgets and technologies that could only be dreamt about; nano-technology being one of the more realistic ones. Nano-technology is the idea that a bunch of tiny little robots comes together to complete a common task. In science fiction, there have been dozens of examples of this. The main one seen in comic books and other sci-fi projects usually has something to do with creating suits of armor that cover the wearer’s body just by pressing a button (Iron Man, Spider-Man, etc) which causes all these little robots to spread and create an armor set that can regenerate broken pieces using more nano-tech.
However, the most realistic use of this technology would be for medical reasons, ranging from vaccines to different medications. Since this technology is far from ever becoming a real technology, the possibilities are endless. These tiny little robots, in theory, would be ~50-100nm wide and would act as a messenger inside the body, bringing the drug into your system much faster.
Because this technology is still very much within the realm of fiction, to say nano-tech would be extremely useful is still to be seen. It really comes down to skepticism and one’s personal feelings and optimism about the future of technology.