Additive refers to a process or substance that is added to something else to enhance its properties or performance. In various fields, such as manufacturing and food production, additives can improve texture, flavor, or durability. For example, in 3D printing, additive manufacturing involves creating objects layer by layer, allowing for complex designs that traditional methods cannot achieve. In the context of chemistry, additives can be substances mixed into products like fuels or plastics to improve their characteristics. Common examples include preservatives in food to extend shelf life or plasticizers in plastics to increase flexibility. These additives play a crucial role in enhancing the functionality of everyday products.