Visual design principles and elements can be applied to video and motion graphics in various genres and styles. For instance, documentaries present factual information or opinions on a topic or issue with interviews, narration, footage, and graphics; an example of this is a video about climate change which uses contrast, repetition, and movement to highlight the problem and the solution. Explainer videos explain concepts, processes, or products with animation, voiceover, text, and graphics; a video about how vaccines work is an example of this which uses shape, color, and space to simplify and visualize the science. Promos are videos that promote a brand, service, or event with music, images, text, and graphics; a video about a music festival is an example of this which uses texture, typography, and sound to create excitement and interest. Lastly, kinetic typography is a motion graphic that animates text to express meaning, emotion, or rhythm with alignment, proportion, and transition; a motion graphic about creativity is an example of this which uses typography, color, and movement to convey the message and the mood.