"Esotericism is about secret knowledge for a small group of people. Esotericism also describes mystical, spiritual or occult viewpoints (point of view). Esotericism studies Gnosticism, Yoga, Alchemy, Magic, Spiritualism, Hypnosis, Astrology, Meditation, Mysticism, and Occultism. Many followers of Abrahamic faiths, particularly Christianity and Islam, have criticized Esotericism as black magic. Esotericism in religion is called "obscurantism". Esotericism can also be about understanding symbolism and hidden meanings of many different books. They include religious books, philosophy books and books about history."