Wastes can be segregated into two categories: biodegradable and non-biodegradable.
Biodegradable wastes: Wastes that rot by the action of decomposers are called biodegradable wastes. These wastes mix with the soil and produce manure. Some examples are dead plants and animals and their products.
Non-biodegradable wastes: Wastes that do not rot by the action of decomposers are called non-biodegradable wastes. These wastes can be recycled to produce new products. Some examples are glass, plastics and metals.