Based on source, polymers can be classified as below:

(i) Natural polymers: Those polymers obtained from plants and animals such as proteins, cellulose, starch and other resins.

(ii) Semi Natural polymers: Those polymers that are derivatives of natural polymers fall under this category. Cellulose Nitrate used as a propellant and in guncotton and Cellulose Acetate used in photography are prepared from Cellulose.

(iii) Synthetic polymers: Those polymers which are prepared in the laboratory are called synthetic polymers. Bakelite, Polythene, synthetic fibers and rubbers are some of its examples.