For certain products, a simple demonstration that shows a person using the device or application might be the best choice. This will show the viewer how to efficiently use your offering in a very practical way. Other products would be better served with an animated explainer video. Animation is a great tool to use in conveying relevant information the user should have. It has the advantage of being able to show processes and features that would be hard to film. This is especially true if there needs to be further explanation or perhaps simplification to better understand your concept. For some products, especially digital ones like applications, it would probably be best to present them by making a video of the screen and explaining the use through a voice over. This will give the audience an experience that shows them exactly where they find what they need in the application.