"Psychoactive" refers to substances that affect the mind and behavior by altering brain function. These substances can change mood, perception, and consciousness. Common examples include alcohol, caffeine, and marijuana. Psychoactive drugs can be natural, like those derived from plants, or synthetic, created in laboratories. Psychoactive substances are often classified into categories based on their effects. Stimulants, such as cocaine and amphetamines, increase alertness and energy, while depressants, like benzodiazepines and opioids, can induce relaxation and reduce anxiety. Understanding these substances is important for recognizing their potential benefits and risks in both medical and recreational contexts.