Indoleacetic acid is a phytohormone commonly known as IAA. Other synonyms for this word may include, 3-(Indol-3-yl) acetic acid, auxins, heteroauxins, and growth hormones. Auxins are responsible for the regulation of plant growth, including stem elongation, root initiation, and fruit development. Besides, these hormones can influence the tropism of plant parts towards or away from gravity, light, touch, and temperature variation. These activities make IAA an essential compound in plant physiology and agriculture. Indoleacetic acid can be used in the propagation of crops, enhancement of crop yields, and plant research. In summary, IAA is a vital compound that regulates plant growth and development, and it has many synonyms that scientists use.