Le Cam's theorem is an important theorem in mathematics that helps us figure out how mathematical models and equations can fit together. It is kind of like putting together a puzzle - you have the pieces but you have to figure out how they fit. Le Cam's theorem tells us how to make all the pieces fit together and make sure the puzzle comes out right. It is often used to show how two different mathematical models can be compared and used together to get a better understanding of a problem or situation. In short, Le Cam's theorem helps us figure out the right way to put together mathematical models and equations.