Extra-sensory perception (ESP) is being able to know things without using the recognized physical senses.
The study of extra-sensory perception is part of parapsychology. Almost all scientists think of it as pseudoscience.[1][2]
The essential problem is that a large portion of the scientific community, including most research psychologists, regards parapsychology as a pseudoscience, due largely to its failure to move beyond null results in the way science usually does. Ordinarily, when experimental evidence fails repeatedly to support a hypothesis, that hypothesis is abandoned. Within parapsychology, however, more than a century of experimentation has failed even to conclusively demonstrate the mere existence of paranormal phenomenon, yet parapsychologists continue to pursue that elusive goal.