Synthetic fibres are small units of chemicals joined together in the form of chain. The chain so formed is called polymer. Polymer is a Greek work in which ‘poly’ means many and ‘mer’ means units. Thus, polymer means ‘made of many units joined together’.Plastic is also a polymer. Units of some plastics have linear arrangement while some plastics are formed by the cross linked arrangement of their units.Plastic can be mould in all types of possible shapes. Plastic can be recycled, coloured, reused, mould or drawn into wires. Thus, plastic is used in making toys, suitcase, bags, cabinets, brush, chairs, tables, and many other countless items. Polythene is one of the most famous types of plastic, which is used in manufacturing of carry bags.