This document provides an introduction to parapsychology. It defines parapsychology as the study of psychological phenomena that go beyond normal sensory perception. It discusses ESP (extrasensory perception) and different types of ESP, including precognition, psychokinesis, telepathy, and clairvoyance. It also discusses experiments that have been conducted to test for ESP, as well as criticisms from skeptics who argue that evidence for ESP is inconclusive or can be explained by deception, bias, or poor methodology.