Okay kiddo, so Monica is a type of radar that helps airplanes and other vehicles stay on course and avoid crashing into things. It works by sending out signals that bounce off of objects like mountains, buildings, and other planes.
Then, the radar system uses these signals to create a picture of everything around the airplane. It's kind of like how you use your eyes to see the world around you, but Monica uses sound waves instead of light waves.
This picture helps pilots know where they are and what's around them, so they can make safe choices about where to fly. Without radar like Monica, it would be really hard for airplanes to stay on track and avoid accidents in bad weather or when it's dark outside.
So, Monica is like a special helper for pilots, making sure they can get you to your destination safely!