Fungal decay is a type of deterioration caused by fungi that feed on organic materials, such as wood, paper, textiles, and food. Fungi secrete enzymes that break down the organic matter into simpler compounds, which they can then absorb and use as nutrients. Fungal decay can lead to structural damage in buildings, furniture, and other objects, as well as spoilage of food and other perishable items. Research in this area focuses on understanding the mechanisms of fungal decay, identifying species of fungi involved, developing methods to prevent or control fungal decay, and finding ways to mitigate its effects on materials and structures.