Fragrances are made up of a combination of fragrance notes that work together to create a unique scent. These notes can be categorized into three types: top notes, middle notes, and base notes.

Top notes are the initial scents that are detected when a fragrance is first applied. They are usually light, refreshing, and evaporate quickly. Examples of top notes include citrus, bergamot, and lavender.

Middle notes, also known as heart notes, are the scents that become more noticeable after the top notes evaporate. They are usually more complex and have a stronger aroma. Examples of middle notes include floral scents such as jasmine, rose, and ylang-ylang.

Base notes are the scents that are detected after the middle notes have evaporated. They are usually heavier and have a more long-lasting aroma. Examples of base notes include vanilla, musk, and sandalwood.

Fragrance compositions refer to the way in which these notes are combined to create a specific scent. Fragrances can be simple or complex, depending on the number and type of fragrance notes used. The composition of a fragrance can also affect its longevity and how it interacts with an individual's body chemistry. Some fragrances may smell different on different people due to these variations in composition and chemistry.

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