Apple Certified Support Professional Practice Exam 2025 – Complete Prep Guide

The concept of iCloud Keychain is best described as the service that shares commonly used secrets across devices. iCloud Keychain securely stores passwords, credit card information, and other sensitive data, making them accessible on all your Apple devices that are signed in to the same Apple ID. This feature allows users to seamlessly log in to websites and apps without needing to remember every password, as iCloud Keychain fills in the credentials automatically.

When you save a password in iCloud Keychain on one device, it syncs that information so you can access it from your other devices. This ensures that users can maintain their security and convenience across multiple devices—whether it's an iPhone, iPad, or Mac—without the hassle of remembering each individual password.

The other options do not accurately reflect the primary function of iCloud Keychain. The service does not focus on local file storage or organization of applications in the cloud. Although it does help with Apple ID passwords by storing them, its true strength lies in sharing all types of stored sensitive information across devices, which makes option B the most fitting description.