Rigid foams are lightweight materials made from polymers that have a solid structure with many tiny air pockets. These air pockets give the foam its rigidity and insulation properties, making it useful in various applications, such as construction and packaging. Common types of rigid foams include polyurethane and polystyrene. Due to their excellent thermal insulation, rigid foams are often used in building insulation and refrigeration. They can also be found in products like furniture and automotive components, where strength and durability are essential. Their versatility makes them a popular choice in many industries.