Psychedelic substances are a class of drugs that alter perception, mood, and cognitive processes. Common examples include LSD, psilocybin (found in magic mushrooms), and DMT. These substances can lead to experiences often described as mystical or profound, affecting how individuals perceive reality. These compounds primarily work by interacting with serotonin receptors in the brain, particularly the 5-HT2A receptor. While some people use psychedelics for recreational purposes, there is growing interest in their potential therapeutic benefits for conditions like depression and PTSD. Research is ongoing to better understand their effects and safety.