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Yetzirah (also known as Olam Yetsirah, עוֹלָם יְצִירָה in Hebrew) is the third of four worlds in the Kabbalistic Tree of Life, following Atziluth and Beri'ah and preceding Assiah. It is known as the "World of Formation".
"Yetzirah" as in "formation" is as opposed to "Beriah" as in "creation": actually taking whatever matter that was created in "Beriah" and shaping it into the basic elements.
Beri'ah (Hebrew: בְּרִיאָה), Briyah, or B'ri'ah (also known as Olam Beriah, עוֹלָם בְּרִיאָה in Hebrew, literally "the World of Creation"), is the second of the four celestial worlds in the Tree of Life of the Kabbalah, intermediate between the World of Emanation (Atziluth) and the World of Formation (Yetzirah), the third world, that of the angels. It is known as the World of Creation, or Korsia (from Heb. כּוּרסָה - "seat, chair", the Throne).
Beri'ah is the first of the four worlds to be created ex nihilo, since Atzilut was emanated rather than created. Thus, although there exist beings that dwell in Atzilut, those beings are overwhelmed by the Divine Light and are unaware of their own existence; in Beri'ah however, the angels are dimly aware of their own existence as distinct from God's.
Atziluth or Atzilut (also Olam Atsiluth, עוֹלָם אֲצִילוּת, literally "the World of Emanation") is the highest of four worlds in which exists the Kabbalistic Tree of Life. It is also known as "near to God." Beri'ah follows it. It is known as the World of Emanations, or the World of Causes. In the Kabbalah, each of the Sephiroth in this world is associated with a name of God, and it is associated with the suit of wands in the tarot.
Malkuth (/mɑːlˈkuːθ/; Hebrew: מַלְכוּת, romanized: Malḵūṯ [malχuːθ] "kingdom"; Ashkenazi: Malkhus [malxus]), Malkhut, Malkhuth, or Malchus, is the tenth of the sefirot in the Kabbalistic Tree of Life.