Moulage is like playing dress-up with very realistic costumes, but instead of pretending to be a princess or a pirate, people are pretending to have injuries or illnesses. It's used to help train medical professionals like doctors and nurses how to take care of patients in emergencies.
People who make moulage use special materials to create realistic injuries on dummies or mannequins that can be dressed up in costumes to look like real people. They might use fake blood, makeup, or even things like yogurt or oatmeal to make it look like someone has a certain type of injury. Then, medical professionals can practice treating these fake injuries and illnesses just like they would with real patients.
So, moulage helps doctors and nurses learn how to take care of people who are really hurt or sick by practicing on very realistic pretend patients.