macOS.
It’s why there’s nothing else like a Mac.
macOS is the operating system that powers every Mac. It lets you do things you simply can’t with other computers. That’s because it’s designed specifically for the hardware it runs on — and vice versa. So your Mac works like magic with your iPhone and other Apple devices. And it works hand in hand with iCloud to keep photos, documents, and other stuff up to date on those devices. macOS also comes with an entire suite of beautifully designed apps. And it’s been built from the ground up with privacy and security in mind.