Fungus is a group of organisms that include mushrooms, molds, and yeasts. Fungus live in almost every environment on earth, from soil to water to air. In fact, humans are constantly exposed to fungi every day. Fungi play an essential role in the natural world by breaking down dead organic matter, such as fallen leaves, into nutrients that other organisms can use.

Fungi can reproduce asexually or sexually, and their cells have a single nucleus. They feed by growing threads called hyphae, which absorb food particles from their environment. Fungi are also able to produce spores, which allows them to disperse and disperse over great distances.

Pathogenic fungi, such as candida and aspergillus, can cause diseases in humans. Antifungal medications can be used to treat these infections. Non-pathogenic fungi, such as mushrooms, are also eaten as food and are an important source of nutrition for many cultures. Some fungi are even used in the production of beer, wine, and certain cheeses.