Mesmerism is a practice developed in the 18th century by Franz Anton Mesmer, a German physician. It involves the use of magnetic forces to influence the mind and body, aiming to induce a trance-like state in individuals. Mesmer believed that an invisible fluid, called "animal magnetism," could be manipulated to promote healing and well-being. The technique gained popularity and led to the foundation of modern hypnosis. Although Mesmer's theories were later discredited, his work laid the groundwork for further exploration into the subconscious mind and the therapeutic use of suggestion in psychology.