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Fragrance concentrations are crucial in determining how a scent behaves on your skin. The primary types include parfum, eau de parfum, eau de toilette, and eau de cologne, each with varying percentages of fragrance oils. Understanding these differences can help you choose a scent that fits your lifestyle and budget. Higher concentrations, like parfum, tend to last longer, while lighter options, like eau de cologne, are ideal for a refreshing spritz throughout the day.