Okay kiddo, so an animal model is like a pretend animal that scientists use to study how things work in a real living animal, like you and me.
For example, let's say a scientist wants to know what happens when a person gets sick with a certain disease. They might use a mouse as an animal model to study the disease because mice are small, easy to handle, and can get sick in a way that's similar to humans.
The scientist will give the mouse the disease, watch how it affects the mouse, and then try different treatments to see if they work. By studying the mouse, the scientist can learn a lot about how the disease works and how to treat it in humans.
Of course, it's not exactly the same as studying a real person or animal, but it can help scientists understand how things work in living things and find ways to help people and animals stay healthy.