When it comes to polystyrene foam, many people refer to it as Styrofoam - a term that has become synonymous with the material. However, there are many other names for polystyrene foam that you may not be aware of, including expanded polystyrene (EPS), extruded polystyrene (XPS), foamed polystyrene, and simply foam board. Each name refers to a slightly different form or manufacturing process of polystyrene foam, but all share the material's lightweight, insulating, and shock-absorbing qualities. Whether you're looking to protect fragile items during shipping or insulate your walls, polystyrene foam - under any name - is an excellent and affordable choice.