Psychedelics are a group of substances known for their ability to alter perception, mood, and cognition by affecting serotonin receptors in the brain. These compounds, which include substances like LSD, psilocybin (magic mushrooms), and DMT, are characterized by their capacity to induce profound changes in consciousness, leading to experiences of enhanced sensory perception, altered time perception, and spiritual or mystical experiences. Psychedelics are increasingly studied for their potential therapeutic benefits in treating conditions such as depression, PTSD, and anxiety, particularly when used in controlled, therapeutic settings.