You can live-annotate powerpoint slides during a presentation using a touchscreen - learn how below!
https://support.microsoft.com/en-us/office/draw-on-slides-during-a-presentation-80a78a11-cb5d-4dfc-a1ad-a26e877da770
Draw and write with ink in Office Apps:
https://support.microsoft.com/en-us/office/draw-and-write-with-ink-in-office-6d76c674-7f4b-414d-b67f-b3ffef6ccf53