Molds have an important role in the cycle of the ecosystems. Its natural general occurrence in forest and soils lets the universality of its abilities foreseen, everyone of plants and animals of formed substance, to fade, and according to its elements the cycle of the ecosystem, to supply again. By the point of view of the human being, two directions are represented
Biodegradation - the desired degradation of for example composting, production of certain goods,
Biodeterioration - the undesirable change of the quality of a material, so that the look changed or one utilization no more possible is.