The term biodegradable refers to materials that can be broken down by natural processes and returned to the environment without causing harm. This means that over time, these substances will decompose into their basic elements and become part of the ecosystem once again. Biodegradable items are often made from organic matter such as plant-based materials or animal waste products, which can be easily broken down by bacteria, fungi, and other microorganisms in soil, water, or air. This process helps to reduce pollution and the accumulation of non-biodegradable waste in landfills and other disposal sites.