TPACK is a combination of different knowledges. It stands for Technological, Pedagogical, and Content Knowledge. There are many times when these knowledges are independent of each other or only two work together. However, when you use all of them together you can have a very powerful lesson. It happens when you use technology to teach a specific content area using specific pedagogy (e.g. instructional strategies). A knowledge and understanding of different representations really help when deciding what technology to use with the different content areas and pedagogy. These representations are textual, visual, auditory, dynamic, and multimodal. In the case of the movie we are making in class, it is a multimodal representation because it is using a combination of the various representations.