Void fill refers to materials used to fill empty spaces in packaging to prevent movement and damage during shipping. It helps protect products from impacts, vibrations, and other potential hazards that can occur in transit. Common types of void fill include bubble wrap, packing peanuts, and air pillows. These materials are lightweight and can be easily molded to fit around items, ensuring they remain secure and intact until they reach their destination. Proper use of void fill can enhance the overall safety and integrity of packaged goods.