Apple’s typography teaches us a crucial lesson about presentation design:
Once upon a time in the minimalist corridors of Cupertino, there was a font that didn’t just want to be read—it wanted to be felt.
It is a "neo-grotesque" sans-serif, similar in feel to Helvetica but with a taller x-height (the height of lowercase letters), making it easier to read from the back of a large auditorium.
Apple doesn't use just one version of San Francisco in its keynotes. They use a carefully layered hierarchy:
If you want, I can produce a short Keynote-ready slide outline or exportable style guide with exact font sizes, line heights, and color swatches.