A polymer is a type of large molecule that is made up of many smaller molecules known as monomers. These monomers are chemically bonded together to form long chains, creating a strong and durable material that we can use for a variety of purposes. Some typical examples include plastics, rubber, and even DNA. Polymers can have different properties depending on the types of monomers used and the way they are bonded together, which makes them versatile materials for many different applications.