Mycelium is a network of thread-like structures called hyphae that form the vegetative part of fungi. It grows underground or within decaying organic matter, breaking down nutrients and helping to recycle them back into the ecosystem. Mycelium plays a crucial role in soil health and plant growth by forming symbiotic relationships with plants, known as mycorrhizae. This fungal network can spread over large areas and is essential for the decomposition of organic materials. Mycelium is also being researched for its potential uses in sustainable materials, such as biodegradable packaging and even in bioremediation to clean up environmental pollutants.