Ein Sof is a term from Kabbalah, a mystical branch of Judaism. It refers to the infinite and unknowable aspect of God. In Kabbalistic thought, Ein Sof represents the source of all creation, existing beyond time and space, and is characterized by its boundless nature. In the Kabbalistic framework, Ein Sof is often associated with the Sefirot, which are ten attributes through which God interacts with the world. These attributes help to explain how the infinite can manifest in a finite universe, allowing for a deeper understanding of the divine presence in everyday life.