Ok, so basically nanobots are some microscopic robots that are researched and developed more than we could think of. Nanobots are believed to be able to perform specific tasks at the molecular/atomic/cellular level.
There has been some experiments with successful results but we all are a bit skeptical about having tiny mechanism traveling in our body.. right?
I've seen this video: https://www.youtube.com/watch?v=vNYb7urwrf4 that shows how this technology works for terminal cancer. It has only been tested on mouses for now but it had great results. Hopefully it can be available for humans too. I think it's awesome what the development of technology can do nowadays.. Don't you?