Fragrance composition refers to the blend of various aromatic ingredients used to create a specific scent. These ingredients can be natural, like essential oils from plants, or synthetic, created in laboratories. The combination of these elements results in a unique fragrance profile that can evoke different emotions and memories. The structure of a fragrance typically includes three layers: top notes, middle notes, and base notes. Top notes are the initial scents perceived upon application, while middle notes develop after the top notes fade. Finally, base notes provide depth and longevity, anchoring the fragrance and ensuring it lasts longer on the skin.