Polystyrene is a type of plastic that is widely used in various products. It is lightweight, durable, and can be easily molded into different shapes. You might find polystyrene in items like disposable cups, food containers, and packaging materials. It can be solid or foamed, with the foamed version often used for insulation and cushioning. One of the most common forms of polystyrene is expanded polystyrene (EPS), which is the white, foam-like material used in packaging and insulation. While polystyrene is convenient, it poses environmental challenges because it is not biodegradable and can contribute to pollution. Recycling efforts are underway to address these issues.