Odorants are chemical substances that have a distinct smell and can be detected by the human nose. They are often found in various environments, including nature, food, and manufactured products. Odorants play a crucial role in our ability to perceive and identify different scents, which can influence our emotions and behaviors. In the field of olfaction, odorants are classified based on their molecular structure and volatility. Some common examples of odorants include essential oils, fragrances, and food aromas. Understanding odorants is important in industries such as perfume, food production, and environmental monitoring.