Hebrew: The Contraction
The action through which The Vessel contracted itself and stopped receiving The Light of The Creator. The Tsimtsum became the cause of the creation of the universe we know. The Tsimtsum controls every aspect of The Creation since it is it’s main and direct cause therefore everything we know exists by contraction, reflection or resistance.
i.e. Every part of The Creation has a small and reduced part of The Endless Light of The Creation.