Similar: Vedic Astrology, Numerology, Tarot
Esoteric refers to information understood by a small group of people or that a small group of people are interested in.
It may be information people are initiated into or information intended for people with special knowledge. Astrology and numerology are examples of esoteric types of information. Esoteric usually means the information is private, specialized, or exclusive.
Sometimes esoteric information is only shared with an inner circle.