A ribbon diagram is a type of picture that often helps us visualize different kinds of molecules. It looks like a ribbon or a string curled up and twisted, with different colors and shapes. Different colors and shapes can represent different kinds of atoms or chemical bonds, so it can help us better understand the structure of molecules. For example, if you were looking at a picture of a water molecule, blue would represent the oxygen atom and white would represent the two hydrogen atoms, so you could easily see how the water molecule is made up.