Molecular modelling is like a 3D Lego set. It helps to show how molecules look and act. It helps scientists to better understand things like how medicines work in our bodies and how materials can be used to build new things. With molecular modelling, scientists can build 3D models of molecules (like proteins, enzymes, drugs, and materials), and then use them to study how the molecules interact. This helps scientists figure out which molecules are the best for certain things and what will happen when they come together.