A fungicide is a type of chemical used to kill or inhibit the growth of fungi, which can cause diseases in plants, animals, and humans. These substances are commonly used in agriculture to protect crops from fungal infections that can lead to reduced yields and quality. By applying fungicides, farmers can help ensure healthy plants and a successful harvest. In addition to agriculture, fungicides are also used in various industries, including food preservation and medicine. For example, some fungicides are applied to stored grains to prevent spoilage, while others are used in treatments for fungal infections in humans, such as athlete's foot or ringworm.