A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
You're welcome Louise! The webcam is possibly there to add the human element to the picture, which I guess can be more interesting to watch.
This is what Microsoft has to say about it (reference below link):
Turn a slide presentation into a video recording that has narration. You record the presentation in PowerPoint and then share it with your audience, who can watch it as a PowerPoint Show or as a video. Some educators use recorded lessons as part of a flipped classroom.
Yes, you will appear that way to your audience when you play the presentation! My webcam quality is not so good, but Microsoft recommends using an external webcam in such a situation with poor camera quality.
Here is a better link:
About recording presentations in PowerPoint
Take Care, Sam