A chemical substance that triggers the brain unconsciously, meaning without realizing it and explaining it logically. We detect pheromones through our nose, just like we detect all smells and scents. However, unlike all other scents, the brain does not perceive the smell of pheromones, but only the result they have. That is, when the nose detects a pheromone, it sends an unconscious command to the brain and the brain changes behavior and gives commands of familiarity, sympathy, and attraction towards the source of the pheromone.