Mold refers to a type of fungus that grows in moist environments and reproduces by releasing microscopic spores into the air. It commonly develops on damp surfaces such as walls, ceilings, carpets, and food, particularly in areas with poor ventilation or water damage. Exposure to mold can trigger allergic reactions, including sneezing, coughing, nasal congestion, eye irritation, and skin rashes, especially in sensitive individuals. In people with asthma or weakened immune systems, mold exposure may worsen respiratory symptoms or lead to more serious infections. Prolonged indoor mold growth can affect air quality and overall health, making moisture control and proper ventilation important for prevention.