A fungus is a member of the plant family that includes dermatophytes, yeasts, and molds. Fungi (the plural of fungus) can be found on living and nonliving things.
In some situations, fungi can infect and damage tissue, such as skin, hair, or nails. Fungi also may be involved in infections throughout the body, such as in the central nervous system or the bloodstream.
WebMD Medical Reference from Healthwise