Polystyrene sheets are versatile plastic materials made from the polymerization of styrene, a liquid hydrocarbon. They are lightweight, rigid, and can be easily cut or shaped, making them popular for various applications, including packaging, insulation, and crafts. These sheets come in different thicknesses and can be transparent or opaque. Due to their excellent insulation properties, polystyrene sheets are often used in construction and refrigeration. They are also resistant to moisture and chemicals, which enhances their durability. However, they are not biodegradable, raising environmental concerns regarding their disposal and impact on ecosystems.