Nanotechnology is like a tiny toolkit that scientists use to build miniscule machines that are invisible to the human eye. Nanotechnology in water treatment is where scientists use these tiny tools to get rid of pollutants and other dirt from water, making it safe for people to drink. They do this by using tiny machines to grab the dirt, like tiny broomsticks that sweep away the dirt particles, and then flush them away. This makes the water look clean and fresh!