Polystyrene is widely used in packaging due to its lightweight and protective qualities, making it ideal for food containers, disposable cups, and cushioning materials for fragile items. In the construction industry, it serves as insulation material in walls, roofs, and floors, helping to improve energy efficiency. Additionally, it is utilized in the manufacturing of consumer goods such as toys, appliance housings, and electronics casings due to its durability and ease of molding. In medical applications, polystyrene is used to produce Petri dishes, test tubes, and other laboratory equipment because of its transparency and sterility. Its versatility also extends to the automotive sector, where it is used in components like dashboards and interior trim.