If you are on a Mac, this font is pre-installed as a system font. If you are on Windows, you can download it from the Apple Developer website.
If you are a designer or a student trying to replicate the Apple aesthetic in Keynote, PowerPoint, or Google Slides, follow these rules: what font does apple use in their keynote presentations
Use pure white text on a deep black background or vice versa. Avoid distracting gradients or busy background images. If you are on a Mac, this font