Auxin is a plant hormone that plays a crucial role in regulating growth and development. It is primarily produced in the tips of shoots and roots, where it promotes cell elongation, helping plants grow taller and roots to extend deeper into the soil. Auxin also influences various processes such as phototropism, where plants bend toward light, and gravitropism, where roots grow downward in response to gravity. In addition to growth, auxin is involved in other important functions, including the formation of flowers, fruits, and leaves. It helps coordinate the plant's response to environmental stimuli, ensuring that growth occurs in the most favorable conditions. Overall, auxin is essential for maintaining healthy plant development.