Mold is a type of fungus that grows both outside and inside buildings. It needs moisture and an organic food source to grow. Common sources of moisture include leaks, flooding, and condensation, while common food sources are materials like paper, wood, and plants. Mold growth can cause various health issues for people such as allergic reactions, asthma, and irritations of the skin, eyes, nose, and throat. To prevent mold growth, it is important to dry any wet or damp areas within 24-48 hours, fix moisture sources, keep buildings dry and well-ventilated, and routinely clean and perform maintenance.