Ectoplasm is a substance that is believed to be produced by spiritualists and mediums during séances. It is said to be a white or greyish substance that can ooze from the bodies of these individuals, and is often compared to ectoplasmic fluid that is secreted from the bodies of certain deep sea creatures.

Ectoplasm is said to be a vehicle for spirits to communicate with the physical world, and it is often seen as a sign that a séance is taking place. Spiritualists believe that ectoplasm is a form of energy that can be manipulated by mediums to create phenomena such as ghost sightings, apparitions, and psychic readings.

However, there is no scientific evidence to support the existence of ectoplasm, and it is widely regarded as a product of wishful thinking or hallucination. Sceptics argue that ectoplasm is often nothing more than a substance produced by the bodies of spiritualists and mediums themselves, such as sweat or mucus.

Despite the lack of scientific evidence, belief in ectoplasm persists, particularly within certain spiritualist communities. Ectoplasm remains an intriguing and disputed phenomenon that continues to captivate the imaginations of many.