What do you understand by Polymer?

Polymers forms a very important class of materials without which life seems very difficult. They are all around us in everyday use. Polymers are very large molecules which are very essential for our existence. It is a main component of our food (starch, protein, etc.), our clothes (polyester, nylon, etc.), our home (wood cellulose, alkyd paint, etc.), and our body (nucleic acid, protein, etc.)

Polymers 
The word polymer is a combination of two Greek words- "Poly+Mers" 
Poly means 'many' Or Mers means 'parts of unit'
         Poly + Mers ➝ many parts of unit
Thus, "A polymers is defined as a large molecule (or macromolecule), formed by joining together thousands of smaller molecule units by chemical bonds (or covalent bonds)".
             
These smaller molecules that interact with each other to form a larger molecule are called "Monomers".
In polymer chemistry, a reaction by which smaller molecules (called monomers) react with each other to form a larger molecule (called polymers), is called "Polymerization".

For Example
Polyethylene is an example of polymer in which the monomer molecule is ethene and a process by which these small molecules of ethene are linked together to form a polymer molecule polyethylene, is called Polymerization Process.
Polythene

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