Molds are very small living organisms that are found indoors and outdoors. There are many different types of mold. Molds grow best in warm, damp, and humid conditions and can spread and increase in numbers by making spores.  Spores help the mold to survive even in dry conditions. Some common molds include Cladosporium, Penicillium  and Aspergillus.

Mold fact sheet (Word* | also in PDF*)