Polymers are large molecules made up of repeating structural units called monomers, which are connected by covalent chemical bonds. They can be found in both natural forms, like proteins and cellulose, and synthetic forms, such as plastics and nylon. Polymers play a crucial role in everyday life, from packaging materials to clothing and medical devices. The properties of polymers can vary widely, allowing them to be tailored for specific applications. For instance, some polymers are flexible and elastic, while others are rigid and strong. This versatility makes polymers essential in various industries, including automotive, aerospace, and healthcare.