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Keynote is Apple's answer to PowerPoint, and .key is its native format. The presentations look gorgeous — Apple's design sensibility shows in the templates, transitions, and typography. Steve Jobs used Keynote for every Apple keynote (the name isn't a coincidence), and it remains the presentation tool of choice for designers and anyone who values visual polish over feature density.
The format stores slides as a ZIP archive containing Protocol Buffer data, preview images, and embedded media. Keynote supports animations, builds, cinematic transitions, and precise typographic control that PowerPoint approximates but doesn't match. The tradeoff: the animations and visual refinements only work in Keynote.
For sharing with non-Apple users, export to PPTX (File → Export To → PowerPoint) or PDF. The PPTX conversion preserves slide content and basic animations but loses Keynote-specific transitions and effects. PDF preserves the exact visual appearance but obviously loses all animation. When in doubt, present from a Mac with Keynote — no conversion preserves the full experience.