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 mind-expanding or transformative, affecting how individuals perceive reality and their sense of self. These substances 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 applications, such as treating depression, anxiety, and PTSD. Research is ongoing to better understand their effects and safety.