You might have made paper garlands in school. How do you make them? You hook a piece of paper to another and repeat the process till you get a large chain of papers, forming a garland. Think of polymers in the same way.
A polymer is a giant molecule which is made by a chain of smaller units and these sub units are known as mers. You know what a molecule is. It is the smallest particle which retains the chemical features of a compound. Each unit is linked to the other by a chemical bond. There is a wide range of polymers around us, from the proteins present in our body to thermoplastics that have a variety of uses. A polymer varies from another based on the qualities it possesses and the process of its formation.
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