Esotericism is the study of knowledge and systems of thought which are usually intended to be philosophical or ethical and mystic. Although most esoteric knowledge was once held in secret, it is now commonly taught openly. It is generally distinct from organized religion, which teaches more openly. While esotericism tends to focus on personal enlightenment and internal spirtual practice, organized religion or exotericism tends to focus on outer spiritual practice and ritual and on laws that govern the society.
Many groups or schools of thought embrace an esoteric tradition or philosophy: