Rhizopus is a type of fungus commonly found in soil, decaying plants, and fruits. It plays an important role in breaking down organic matter, helping to recycle nutrients in the ecosystem. One of the most well-known species is Rhizopus stolonifer, often referred to as black bread mold, which can be seen growing on old bread and fruits. This fungus reproduces quickly through spores, which can spread easily in the air. While Rhizopus is essential for decomposition, it can also cause food spoilage and, in some cases, infections in humans, particularly in those with weakened immune systems.