Suggested answer

Global unsubscribe (All Subscribers list): The subscriber is marked as globally unsubscribed across all commercial sends from the entire Marketing Cloud account. They will not receive any commercial email regardless of which list or DE they appear in.
Publication list unsubscribe: The subscriber opts out of a specific publication list (email category/topic). They still receive emails from other publication lists. Enables a preference centre experience where subscribers manage their communication preferences.
One-click unsubscribe (RFC 8058 / List-Unsubscribe-Post): A machine-actionable unsubscribe mechanism required by Gmail and Yahoo since February 2024 for bulk senders (>5,000/day). The email header includes a List-Unsubscribe-Post header; email clients expose a native unsubscribe button that POSTs directly to the unsubscribe endpoint without the subscriber needing to click a link in the email body. Marketing Cloud SAP enables this automatically.

Practice content for interview preparation; not an official vendor answer. Verify details against current product documentation.

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