Multimedia combines different forms of content like text, audio, images, video and interactive elements. It is used in advertising, education, media, gaming, science, arts and more. Video, audio and multimedia are effective communication tools for showing concepts, connecting with audiences, and establishing credibility. When creating multimedia presentations, best practices include using words and graphics together, keeping images relevant, presenting text as audio, allowing interactivity, and designing for self-running or navigable formats like slideshows or video. While multimedia increases learning and engagement, it also has costs and requires proper hardware and configuration to implement.