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.
A glance at the presentation file size should tell you. If the size is at least as big as the total file size of the videos, then they are embedded.
When placing video, if you simply click on the Insert button, the file is embedded. You do not need to send the audio and video files separately, which would only confuse most users.
The right-click Save Media As command is for extracting the embedded video from your presentation to a separate video or audio file.