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|The Sephirot in Jewish Kabbalah|
Yesod (Hebrew: יסוד "foundation") is a sephirah or node in the kabbalistic Tree of Life, a system of Jewish philosophy. Yesod, located near the base of the Tree, is the sephirah below Hod and Netzach, and above Malkuth (the kingdom). It is seen as a vehicle allowing movement from one thing or condition to another (the power of connection). Yesod, Kabbalah, & the Tree of Life are Jewish concepts adopted by various philosophical systems including Christianity, New Age Eastern-based mysticism, & Western esoteric practices.
According to Jewish Kabbalah, Yesod is the foundation upon which God has built the world. It also serves as a transmitter between the sephirot above, and the reality below. The light of the upper sephirot gather in Yesod and are channelled to Malkuth below. In this manner, Yesod is associated with the sexual organs. The masculine Yesod collects the vital forces of the sephirot above, and transmits these creative and vital energies into the feminine Malkuth below. Yesod channels, Malkuth receives. In turn, it is through Malkuth that the earth is able to interact with the divinity.
Yesod plays the role of collecting and balancing the different and opposing energies of Hod and Netzach, and also from Tiferet above it, storing and distributing it throughout the world. It is likened to the 'engine-room' of creation. The Cherubim is the angelic choir connected to Yesod, headed by the Archangel Gabriel. In contrast, the demonic order in the Qliphothic sphere opposite of Yesod is Gamaliel, ruled by the Archdemon Lilith.
Other philosophic systems
According to Jewish Kaballistic philosophy, Yesod is responsible for the powers of communication, connection and contact with external reality within the soul, unifying the material world of Malkuth with the other Sephiroth. Therefore, some Christians compare Yesod to the third person of the Holy Trinity, the Holy Spirit. The Holy Spirit is defined by some Christians as one aspect of the Triune God. These Christians believe that the Holy Spirit is the aspect of god that unifies God with humanity. 
In esoteric Western philosophy, according to the writer Dion Fortune, Yesod is considered to be "of supreme importance to the practical occultist...the Treasure House of Images, the sphere of Maya, Illusion." 
- Franck, Adolphe (1967). The Kabbalah (Second printing ed.). Secaucus, New Jersey: University Books. pp. 26–27 ff.
- Ashcroft-Nowicki, Dolores (1983). The Shining Paths. England: The Aquarian Press.
- Fortune, Dion (1935). The Mystical Qabalah (1984 American paperback ed.). York Bach, Maine: Samuel Weiser, Inc. p. 1. ISBN 0-87728-596-9.
- Miller, Moshe. "Netzach, Hod, & Yesod". Kabbalah Online. Chabad.org. Retrieved 6 August 2015.
- Ginsburgh, Yitzchak. "The Ten Sefirot: Divine Emanations". website. Retrieved 25 February 2013.
- Grillet, Angela Moehrle de. "A JOURNEY THROUGH THE TREE OF LIFE". website. Retrieved 25 February 2013.
- St. Thomas Aquinas (1920). The Summa Theologica: First Part - The Procession of the Divine Persons (second and revised edition (Literally translated by Fathers of the English Dominican Province) ed.).
- Pope Pius XII (1943). Mystici Corporis Christi.
- Fortune, The Mystical Qabalah, page 1