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The iCloud keychain is designed to automatically share secrets, such as passwords, credit card information, and Wi-Fi credentials, between devices that are signed in with the same Apple ID. This feature enhances convenience and security by ensuring that the information is synchronized across all devices, including Macs, iPhones, and iPads. When a user saves a password on one device, it can be accessed on any other device linked to the same iCloud account, providing seamless integration and a better user experience.

In contrast, a local keychain only stores data locally on a single device, meaning that the information is not accessible from other devices. The main keychain is the default keychain that resides on the device and is not specifically designed for sharing. The system keychain is intended for system-level access, containing keys and certificates used by the system and applications. It is also not meant for user data synchronization across devices. Thus, the iCloud keychain stands out as the only option that provides automatic sharing of secrets between devices.