Mold is a type of fungus that grows in damp, humid environments. It’s a concern because: 1. Health Risks: Causes allergies, respiratory issues, and can produce toxic substances. 2. Structural Damage: Deteriorates building materials, leading to costly repairs. 3. Unpleasant Odor: Produces a musty smell. 4. Aesthetic Damage: Stains and discolors surfaces.