Ectoplasm is a term used in spiritualism to describe a substance that is said to emanate from a medium during a séance. It is often depicted as a viscous, gelatinous material that can take various forms, including mist or a solid-like substance. Spiritualists believe that ectoplasm serves as a bridge between the physical and spiritual worlds, allowing spirits to communicate with the living. The concept of ectoplasm gained popularity in the late 19th and early 20th centuries, particularly through the work of mediums like Madame Blavatsky and Eusapia Palladino. While many claimed to produce ectoplasm, scientific investigations often debunked these phenomena as hoaxes or tricks. Today, ectoplasm remains a topic of interest in paranormal studies and popular culture.