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.
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.
The Four Worlds (Hebrew: עולמות ʿOlāmot, singular: ʿOlām עולם), sometimes counted with a primordial world, Adam Kadmon, and called the Five Worlds, are the comprehensive categories of spiritual realms in Kabbalah in a descending chain of existence.
The concept of "Worlds" denotes the emanation of creative lifeforce from the Ein Sof or Godhead through progressive, innumerable tzimtzumim or concealments. Kabbalists identified the names of these worlds from Isaiah 43:7, "All who are linked to My name, Whom I have created, Formed, and made for My glory (Biblical Hebrew: כֹּ֚ל הַנִּקְרָ֣א בִשְׁמִ֔י וְלִכְבוֹדִ֖י בְּרָאתִ֑יו יְצַרְתִּ֖יו אַף־עֲשִׂיתִֽיו׃, romanized: Kol hanniqrā b̲išmi wəlik̲b̲od̲i bərāt̲iw yəṣartiw ʾap̲-ʿăśit̲iw.)". The names are thus Beri'ah "Creation," Yetzirah "Formation," Assiah "Action," and Atziluth "Emanation." Below Assiah, the lowest spiritual world, is the Assiah gashmi "Physical Assiah," the physical universe, which enclothes the last two sefirot, Yesod and Malkuth. Collectively, the Four Worlds are referred to as אבי״ע Aviyaʿ after their initial letters. In addition to the functional role each world has in the process of creation, they also embody dimensions of consciousness within human experience.
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.