With iCloud, you can keep your information up to date on all your devices, and collaborate with friends and family. Your iMac works seamlessly with your iPhone, iPad, iPod touch, or Apple Watch when you use iCloud and sign in to each of them with the same Sign in to iCloud on all your devices.
Access your content across devices. With iCloud, you can securely store, edit, and share your documents, photos, and videos across devices to make sure you’re always up to date. To get started, see Work with multiple devices, and All your devices.