Natural Polymers - These are substances of natural origin, i.e., these are found in nature mainly in plants and animals. The well known natural polymers are proteins (polymers of amino acids), polysaccharides (polymers of monosaccharides), etc.
SyntheticPolymers - These are man made polymers i.e., polymers synthesised in laboratory. These include synthetic plastics, fibres and synthetic rubber. Specific examples are polythene and dacron.