The main function of phytochemicals in plants is to provide **defense** against threats such as herbivores, insects, and pathogens. These compounds often have antioxidant properties and can help in the plant's survival by deterring pests or inhibiting the growth of fungi and bacteria. Additionally, phytochemicals contribute to the plant's color and aroma, which can attract pollinators. Many phytochemicals also have beneficial health effects when consumed by humans, promoting overall well-being and reducing the risk of chronic diseases.