LSD, also known as lysergic acid diethylamide, is one of the most well studied psychedelic substances in the world. Discovered in 1938 by chemist Albert Hofmann, LSD has shaped psychology, art, and modern understandings of consciousness. People who use LSD often describe heightened awareness, vivid imagery, emotional insight, and a sense of connection that feels deeper than everyday reality. Science is now revealing why these effects occur and how LSD interacts with the brain