PLGA stands for poly(lactic-co-glycolic acid), a copolymer that is widely used in biomedical applications. It is composed of two monomers, lactic acid and glycolic acid, which can be polymerized in various ratios to produce copolymers with different properties. PLGA is known for its biodegradability and biocompatibility, making it an ideal material for medical devices, drug delivery systems, and tissue engineering.