requestAnimationFrame is optimal for animations because: 1) Synchronizes with the browser's display refresh rate, 2) Provides smoother animations by aligning with frame boundaries, 3) Automatically pauses when the tab is inactive, saving resources, 4) Reduces visual artifacts and frame skipping, 5) Better power efficiency, especially on mobile devices, 6) Manages frame timing automatically for optimal performance, 7) Prevents multiple repaints within the same frame, 8) Integrates with the browser's rendering pipeline for maximum efficiency.