Polymers are used in almost every area of modern living. Grocery bags, soda and water bottles, textile fibers, phones, computers, food packaging, auto parts, and toys all contain polymers. Even more-sophisticated technology uses polymers.
On the basis of the mode of their formation, the polymers can be classified as addition polymers and condensation polymers.
Addition polymers are formed by chain growth polymerization and condensation polymers are formed by the combination of two monomers by the elimination of a small molecule like water or methyl alcohol.