Aspergillus is a type of fungus that can be found in various environments, including soil, decaying plants, and even indoor spaces. It plays a crucial role in breaking down organic matter, helping to recycle nutrients in nature. While many species of Aspergillus are harmless, some can cause health issues, especially in people with weakened immune systems. Certain species of Aspergillus are also used in food production and biotechnology. For example, Aspergillus oryzae is essential in making traditional Asian foods like soy sauce and sake. Understanding this fungus helps us appreciate its benefits and manage its potential risks.