Odors are chemical substances that can be detected by the sense of smell. They are produced by various sources, including food, flowers, and animals. When these substances enter the nose, they interact with olfactory receptors, sending signals to the brain that help identify different smells. Odors can be classified as pleasant or unpleasant, depending on individual perception and cultural context. They play a significant role in flavor, influencing how we experience taste. Additionally, odors can evoke memories and emotions, making them an important aspect of human experience and communication.