The sour flavor is one of the five basic tastes, characterized by its sharp, tangy, and refreshing qualities. It often evokes a strong, puckering sensation on the palate, commonly associated with foods rich in organic acids, such as citric acid found in citrus fruits (like lemons and limes), acetic acid in vinegar, and lactic acid in fermented products like yogurt. Sourness can enhance and balance the overall flavor profile of dishes, cutting through richness and adding brightness. In cooking, sour flavors can invigorate salads, marinades, and sauces, providing a zesty contrast that elevates the taste experience and stimulates the appetite