Mysticism refers to extraordinary experiences that transcend perceived reality and transform the individual. Section 1 introduces key features such as noetic and ineffable qualities, alongside psychological typologies and a fourfold hierarchy of mystical forms. Section 2 explores monistic mysticism, where self and ultimate reality merge in oneness and ego-dissolution, illustrated through perennial philosophy and its critiques. Section 3 examines nondualistic mysticism, in which the self remains distinct yet is absorbed into a transcendent order, exemplified in world religions where ego yields to the divine. Section 4 discusses dualistic mysticism, where the self encounters a separate nonhuman reality, often expressed through shamanism, spiritist visions, and psychedelic states. Section 5 presents pluralistic mysticism, emphasizing multiple dimensions of self and reality, integrating embodied and spiritual aspects, and drawing on nonphysicalism and parapsychology. Section 6 synthesizes these perspectives, stressing that transcendent realities require self-transformation and that mystical insights can inform daily life across culture.