Fungus is a type of organism that belongs to the kingdom Fungi. Unlike plants, fungi do not perform photosynthesis; instead, they obtain nutrients by breaking down organic matter. They can be found in various environments, from soil to decaying wood, and play a crucial role in ecosystems as decomposers. Fungi come in many forms, including molds, yeasts, and mushrooms. Some fungi are beneficial, such as those used in baking and brewing, while others can be harmful, causing diseases in plants, animals, and humans. Understanding fungi is important for agriculture, medicine, and environmental science.