Ficolin is a special type of protein that helps your body fight off bad germs and viruses. It's kind of like a superhero that helps keep you healthy!
The way it works is that ficolin goes around in your body looking for bad guys. When it finds them, it attaches to them and signals to other parts of your immune system to come and help fight them off.
Imagine that your body is like a castle and ficolin is a knight. When ficolin comes across an enemy - let's say a dragon - the knight sends a message to the other soldiers in the castle to come and help fight the dragon. These soldiers are like your other immune system cells that help protect you from sickness.
Ficolin is just one of the many ways that your body keeps you healthy and strong!