It is about putting a personal AI system close enough to your life that it can understand your goals, preferences and circumstances and eventually act on your behalf. It is a direct philosophical contrast with the idea that one highly controlled AI system should become the dominant interface for everyone. He has described the eventual personal AI as something that "knows us deeply, understands our goals, and can help us achieve them." The assistant Zuckerberg describes would operate continuously across areas such as work, health, finances, relationships and personal interests. The harder unresolved question is what happens when a personal AI becomes deeply embedded in someone's life.