Explain about photo degradable plastic and biodegradable plastic?

Capable of decomposing when exposed to light. Photodegradable plastic, for example, becomes brittle and breaks into smaller pieces when exposed to sunlight, helping reduce litter and environmental damage. AndBiodegradable plastic is plastic that decomposes naturally in the environment. This is achieved when microorganisms in the environment metabolize and break down the structure of biodegradable plastic. The end result is one which is less harmful to the environment than traditional plastics.