Chytrid fungus, scientifically known as Batrachochytrium dendrobatidis, is a type of fungus that primarily affects amphibians, particularly frogs. It thrives in moist environments and can spread rapidly through water. This pathogen infects the skin of amphibians, disrupting their ability to absorb water and electrolytes, which can lead to severe health issues and even death. The emergence of chytrid fungus has been linked to significant declines in amphibian populations worldwide, contributing to the extinction of several species. Conservation efforts are underway to understand and combat the spread of this disease, as it poses a serious threat to global biodiversity.