When you are creating a presentation, you can add speaker notes that you can refer to later while delivering the slide show to an audience. Then, during your presentation, the speaker notes are visible on your monitor, but aren't visible to the audience. So the Notes pane is the place to store extra information that doesn't need to be on the slide, but that you may want to talk about when you give your presentation.
Add notes while creating your presentation
The Notes pane is a box that appears below each slide. (It is outlined in magenta in the picture below.) An empty Notes pane will prompt you with text that says, Click to add notes. Type your speaker notes there. If you don’t see the Notes pane or it is completely minimized, click Notes on the task bar across the bottom of the PowerPoint window (also marked in magenta in the picture below).
If your notes exceed the allotted length of the Notes pane, a vertical scroll bar appears on the side of the pane. In PowerPoint 2013 and PowerPoint 2016, you can also enlarge the Notes pane by pointing your mouse at the top line of the pane and then dragging upward after the pointer turns into a double-headed arrow. (In PowerPoint Online, the size of the Notes pane can't be changed.)
What the notes look like in Presenter view
When your computer is connected to a projector and you start the slide show , Presenter View appears on your computer's screen, while only the slides appear on the projector screen. In Presenter view, you can see your notes as you present, while the audience sees only your slides:
Presenter view isn't something you have to create. PowerPoint cobbles it together it for you by gathering the notes you've typed for each slide and pairing them with a set of controls for navigating through your presentation.
By default, PowerPoint is set to use Presenter view when you run a slide show. You can change this setting on the Slide Show tab of the PowerPoint ribbon:
Read Start the presentation and see your notes in Presenter view for more details about how to see and use Presenter view.