Foam peanuts, also known as packing peanuts, are small, lightweight, and often irregularly shaped pieces made from expanded polystyrene or biodegradable materials. They are commonly used as cushioning material in packaging to protect fragile items during shipping. Their shape allows them to fill empty spaces in boxes, preventing movement and reducing the risk of damage. These packing materials are popular in the shipping industry due to their low cost and effectiveness. While traditional foam peanuts are not environmentally friendly, many companies now offer biodegradable packing peanuts made from natural materials like cornstarch, which break down more easily in the environment.