What is a notes page in PowerPoint?

It allows you to type in notes about the presentation slide you are working on. They can be printed out. You can have them with you as you are running the presentation. This can be a help to you to remind you of things that you want to say when giving your presentation. They will not appear on the screen when the presentation is running, so your audience will not see them, but you would not want them to. They are for your use to help you as you give your presentation.