<human>:  What is the difference between biodegradable and non-biodegradable materials?
<bot>: The main difference between biodegradable and non-biodegradable materials is that biodegradable materials are able to break down into simpler forms naturally by living organisms, while non-biodegradable materials are not able to be broken down and stay intact in the environment. Biodegradable materials can come from a variety of sources including from plants, animals, and manufactured products. Non-biodegradable materials, on the other hand, are typically made from synthetic products like plastics, rubber, and certain metals that are not able to be broken down.