A polymer is a large molecule made up of many smaller units called monomers. These monomers are linked together in long chains, creating materials with unique properties. Common examples of polymers include plastic, rubber, and DNA. They can be found in everyday items like water bottles, toys, and clothing. Polymers can be natural or synthetic. Natural polymers, such as cellulose in plants and proteins in living organisms, play essential roles in life. Synthetic polymers, like nylon and polyethylene, are created through chemical processes and are widely used in various industries. Their versatility makes them crucial in modern technology and manufacturing.