Biodegradable plastics serve two main purposes: first, replacing conventional plastics in applications where post-use collection is difficult, such as agricultural mulch and disposable packaging; second, substituting other materials to add convenience, like in golf tees or afforestation supports. Polylactic acid (PLA) is a leading biodegradable material. Applications span multiple sectors: agriculture (mulch films, water-retaining materials, seedling pots); packaging (shopping bags, compost bags, food containers); consumer goods (disposable cutlery, gloves, tablecloths); sports (golf tees); hygiene (feminine products, diapers, medical sheets); and healthcare (bandages, sutures, drug-release materials). Companies like Xiamen Keyuan Plastic Co., Ltd. supply PLA materials, supporting sustainable transitions across industries.