Perfume is a mixture of fragrant oils, fixatives, and solvents used to scent the body or living spaces. It has been used for centuries, originally for religious purposes and now as a sign of sophistication. Perfume is made through extracting oils from plants or animals, blending them according to a formula, aging the blend, and mixing it with alcohol as a solvent. It is classified based on oil concentration and lasting time. Perfume triggers emotions and memories through scent and is used to increase attractiveness. Future perfumes may increasingly use synthetic chemicals and target pheromone receptors in the brain.