Indole-3-acetic acid is widely used in agriculture as a plant hormone to promote growth and development. It stimulates root formation in cuttings, enhancing the propagation of plants. It also plays a role in cell elongation, division, and differentiation, improving overall plant health. Additionally, it is applied in tissue culture to induce callus formation and organogenesis. In horticulture, it aids in fruit setting and delays premature fruit drop, increasing yield. Its use in research helps study plant responses to environmental stresses and hormonal regulation.