Mold reproduce by means of tiny spores; the spores are invisible to the naked eye and float through outdoor and indoor air. They may begin growing indoors when spores land on surfaces that are wet. There are many types of mold, and none of them will grow without water or moisture.
It is impossible to get rid of all mold spores indoors; some mold spores will be found floating through the air and in house dust. The mold spores will not grow if moisture is not present. However, indoor mold growth does look unsightly, and can be potentially harmful