Ohr is a central Kabbalistic term in Jewish mysticism. The analogy of physical light is used as a way of describing metaphysical divine emanations. Shefa "flow" (שפע) and its derivative, hashpoah "influence" השפעה), are sometimes alternatively used in Kabbalah, a term also used in Medieval Jewish philosophy to mean divine influence, while the Kabbalists favour Ohr because its numerical value equals ר״ז, a homonym for רז rāz "mystery". It is one of the two main metaphors in Kabbalah for understanding God, along with the other metaphor of the human soul-body relationship for the sefirot.

Kabbalah or Qabalah is an esoteric method, discipline and school of thought in Jewish mysticism. A traditional Kabbalist is called a Mekubbal. The definition of Kabbalah varies according to the tradition and aims of those following it, from its origin in medieval Judaism to its later adaptations in Western esotericism. Jewish Kabbalah is a set of esoteric teachings meant to explain the relationship between the unchanging, eternal God—the mysterious Ein Sof —and the mortal, finite universe. It forms the foundation of mystical religious interpretations within Judaism.