Adding narration to your presentation allows you to post PowerPoint lectures online complete with your own audio commentary. You must have a microphone attached or internal to your computer in order to record narration. Your computer may have specific settings or software that enable your microphone and set recording levels.
You have two options when recording narration: you can record narration for individual slides, or you can play your presentation and record narration for the entire slide show. You can also save the slide timings along with the narration so that the presentation plays automatically.