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Fast User Switching is a feature in macOS designed to allow multiple users to log in to their accounts and switch between them without needing to log out. This functionality is particularly useful in environments where multiple accounts are used, such as families sharing a device or in a workplace scenario with different users accessing specific applications and files.

When Fast User Switching is enabled, users can switch accounts quickly by selecting their user name from the menu bar or by using keyboard shortcuts. Each user’s session remains active and separate, preserving their individual open applications and files. This means when a user switches back, they find everything as they left it, ensuring a seamless experience.

Other options like User Access Management, Account Switching Options, and Quick User Access either do not exist in macOS terminology or do not specifically encapsulate the ability to switch users swiftly while maintaining active sessions. The clarity and efficiency of Fast User Switching make it the correct choice in this context, as it is a well-established feature in the macOS environment.