Polystyrene is widely used in packaging due to its lightweight and durable properties, making it ideal for protecting goods during transport. It is commonly found in disposable containers, trays, and cups in the food industry because it provides excellent insulation and is cost-effective. In construction, polystyrene is used as insulation material in walls, roofs, and floors, contributing to energy efficiency by reducing heat transfer. Additionally, it is utilized in the manufacture of consumer electronics, appliances, and automotive parts, where its moldability and strength are advantageous. Polystyrene is also employed in medical applications, such as Petri dishes and test tubes, due to its transparency and sterility.