Sour, or acidic, refers to a taste sensation that is often sharp and tangy. This flavor is commonly found in foods like lemons, vinegar, and sour candies. The sourness comes from the presence of acids, such as citric acid in citrus fruits or acetic acid in vinegar, which stimulate specific taste receptors on the tongue. In addition to taste, acidity plays a crucial role in various chemical reactions and processes. For example, in cooking, acidic ingredients can enhance flavors and preserve food. In the human body, maintaining a balanced pH level is essential for overall health, as extreme acidity can lead to discomfort or health issues.