What is the difference between Oracle Data Guard and Oracle Active Data Guard?

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Oracle Data Guard: Provides standby database for disaster recovery (read-only when open). Oracle Active Data Guard: Allows real-time query on the standby database while applying logs.
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Oracle Data Guard: Provides standby database for disaster recovery (read-only when open). Oracle Active Data Guard: Allows real-time query on the standby database while applying logs.
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Oracle Data Guard: Provides standby database for disaster recovery (read-only when open). Oracle Active Data Guard: Allows real-time query on the standby database while applying logs.
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