In PowerPoint's normal view, the notes section is visiable below the slide.
If you are using PowerPoint for presentations, then you're typically
summarising the content. Instead of adding too much detail into your
presentation (making the text tiny or cluttered), you speak about any
additional context, detail or related information - which you include for
yourself in the notes. Then when you're conducting the presentation, print
a copy of the presentation with notes for yourself. You can then refer to
the notes for each slide, but not show them to the audience. You can print
with or without notes.