Mold is classified as a fungus, not a plant. Unlike plants, fungi do not use photosynthesis to produce energy. Mold belongs to a group of organisms that also includes yeasts and mushrooms. It typically grows in damp, warm, and humid environments, decomposing organic matter.
Molds reproduce through spores, which can easily spread through the air and land on surfaces where they can grow if conditions are right. Unlike plants, fungi have a different cellular structure; they lack chlorophyll and have cell walls made of chitin, which is a polymer that provides structure and support.
Understanding that mold is a fungus is important for various reasons, particularly in health and safety contexts, as some molds can produce allergens or mycotoxins that may be harmful to humans and animals.