Mold growth occurs when mold spores, which are tiny and often invisible, find a suitable environment to thrive. This typically includes damp, warm, and dark areas where organic materials, like wood or food, are present. Mold can reproduce quickly, spreading through the air and surfaces, and can be found both indoors and outdoors. Mold is a type of fungus that plays a role in breaking down organic matter in nature. However, when it grows indoors, it can cause health issues, such as allergies and respiratory problems. Common types of mold include Aspergillus, Penicillium, and Stachybotrys, often referred to as black mold.