A lot of the drugs we use to treat illnesses are effective in countering the effects of the bacteria or other troublemakers, but since they are floating through your bloodstream, they may affect other parts of your body as well, and have the potential to give unwanted, sometimes very nasty side effects. Nanotechnology promises a way to deliver a drug to the affected area, and only to that particular place. This can happen because the drug can be encapsulated in nanostructures that are designed to attach themselves to a particular bacteria or virus, and dissolve, thus releasing the medicine. And you would only need a fraction of the medicine! Amazing, huh?