What is meant by the term Degradable Plastic?

Degradable bags: Plastic in which degradation does not occur by the naturally occurring microorganism. Actually the degradation induced due to Oxygen / UV radiation / Heat / Water over the years. Oxo-degradable, Photo-degradable, Thermal degradable and Hydrolytic-degradable plastics are the plastics in which degradation do not happen biologically. They break the chain of polyethylene into smaller and smaller and remain as plastic in soil and water.