A scientific model is an image or drawing, structure, visual, mathematical computation, or graphical representation that aims to depict a scientific theory. Scientific models help to make an abstract, conceptual, or mathematical phenomenon concrete. In other words, scientific models try to make something that may be difficult to understand a bit easier to comprehend. For example, I used a structural model of the ear when I taught sound and hearing. This helped my students to see the parts of the ear, visualize where sound waves entered the ear, and understand how each part worked in the overall function of hearing. Other models often used in secondary education classrooms include posters, demonstrations, molecular ball and stick models, analogies, and simulations.