An Apple support document describing the company's new iCloud Keychain makes a surprising claim that it can sync passwords across devices without ever storing them in the cloud.
If true, this would be an important advance in password management, allowing users to create long, complicated passwords on one device and have the passwords automatically sync to their other devices, but without storing data on Apple's servers.
Today, most password managers sync data across devices by storing the data in a cloud service. There are ways to sync passwords directly among devices without cloud storage, for example with a Wi-Fi sync option in the latest versions of 1Password. However, this requires some extra steps that reduce the convenience a good password manager offers.