PowerPoint multimedia allows you to add video, soundtrack and a limited degree of animation to enhance your PowerPoint slides. Basic PowerPoint slides become more interesting and interactive with these audio, video, quizzes, and prebuilt interactions.
Office Mix is a free extension to PowerPoint that makes it easy to turn your PowerPoint presentations into interactive online lessons and share them with your students. With Office Mix, you can add:
… all from within PowerPoint. Publishing a mix is as easy as uploading it to the web and deciding who can view it. Office Mix shows you data about who watched your mix, how much time they spent on each slide, and how they answered your quiz and poll questions.