| The Four Worlds in Kabbalah |
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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.