Auxin is a plant hormone that plays a crucial role in growth and development. It helps regulate various processes, such as cell elongation, root formation, and fruit development. By promoting cell division and elongation, auxin allows plants to grow towards light, a phenomenon known as phototropism. Additionally, auxin influences the formation of roots and the development of flowers and fruits. It is produced in the tips of shoots and roots, and its concentration affects how plants respond to their environment. Understanding auxin is essential for improving agricultural practices and enhancing plant growth.