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Supermassive black hole accretion and feedback play central role in theevolution of galaxies, groups, and clusters. I review how AGN feedback istightly coupled with the formation of multiphase gas and the newly probedchaotic cold accretion (CCA). In a turbulent and heated atmosphere, cold cloudsand kpc-scale filaments condense out of the plasma via thermal instability andrain toward the black hole. In the nucleus, the recurrent chaotic collisionsbetween the cold clouds, filaments, and central torus promote angular momentumcancellation or mixing, boosting the accretion rate up to 100 times the Bondirate. The rapid variability triggers powerful AGN outflows, which quench thecooling flow and star formation without destroying the cool core. The AGNheating stifles the formation of multiphase gas and accretion, the feedbacksubsides and the hot halo is allowed to cool again, restarting a new cycle.Ultimately, CCA creates a symbiotic link between the black hole and the wholehost via a tight self-regulated feedback which preserves the gaseous halo inglobal thermal equilibrium throughout cosmic time.

The self-regulated AGN feedback loop: the role of chaotic cold accretion