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Yesod (Hebrew: יסוד "foundation") is a sephirah in the kabbalistic Tree of Life. Yesod is the sephirah below Hod and Netzach, and above Malkuth (the kingdom).
Christian Kabbalah 
The sephirah of Yesod translates spiritual concepts into actions that unite us with God.
It is often associated with the Moon, because it is the sphere which reflects the light of all the other sephirot into Malkuth, and it is associated with the sexual organs, because it is here that the higher spheres connect to the earth.
It 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 archangel of this sphere is Gabriel, and the Cherubim is the Angelic order.
Yesod was taught to be the sephirah of Sabbatai Zevi.
Other religions 
The third person of the Holy Trinity, the Holy Spirit, is the Christian counterpart of the Yesod. The Holy Spirit is seen by mainstream Christians as one Person of the Triune God, who revealed His Holy Name YHWH to his people Israel, sent His Eternally Begotten Son Jesus to save them from their Sins, and sent the Holy Spirit to sanctify and give life to his Church. The Holy Spirit is known as the aspect of god that sanctifies mankind, unifying God with it. Parallel to Yesod, which is the middle axis of the Sephirot, the Yesod is responsible for the powers of communication, connection and contact with external reality within the soul, unifying Malchut to the Sephirot itself, being the symbol of Human to God union. In the Christianism, the Holy Spirit is responsible for enacting the contact with Abraham, in the Christian Kabbalah, Yesod is known as the symbol for the covenant between Abraham and God and their pact.
Eastern Mysticism 
Comparing with forms of Eastern mysticism, Yesod is most commonly associated with the Swadhisthana chakra, which is associated with the moon, with sexuality, and with the unconscious.
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