2-(2-(sec-Butyl)phenoxy)acetic acid is a phenoxyacetic acid derivative primarily used as a selective herbicide for controlling broadleaf weeds in cereal crops such as corn, wheat, and barley. It functions as a synthetic auxin, mimicking plant hormones to cause uncontrolled growth, epinasty, and eventual death of target weeds, thereby reducing competition and enhancing crop yield and quality. Additionally, it serves as a key intermediate in the synthesis of other herbicides and plant growth regulators. Its applications extend to research in plant physiology, aiding in the development of new agricultural practices while requiring careful use to minimize environmental impact and non-target effects.