Material type refers to the classification of substances based on their physical and chemical properties. Common categories include metals, plastics, ceramics, and composites. Each material type has unique characteristics that determine its suitability for various applications, such as construction, manufacturing, and packaging. Understanding material types is essential in fields like engineering and design. For instance, steel is a metal known for its strength, while polyethylene is a widely used plastic due to its flexibility and resistance to moisture. Choosing the right material type can significantly impact the performance and durability of a product.