Mold spores are tiny, reproductive units produced by mold, a type of fungus. These spores are often invisible to the naked eye and can be found in the air, soil, and on various surfaces. They play a crucial role in the life cycle of mold, allowing it to spread and colonize new areas. When conditions are favorable, such as warmth and moisture, mold spores can germinate and grow into new mold colonies. This process can occur indoors and outdoors, making it important to manage humidity and cleanliness to prevent mold growth in places like homes and buildings.