A thermoplastic is a type of plastic that becomes soft and moldable when heated and hardens upon cooling. This property allows it to be reshaped multiple times without undergoing any significant chemical change. Common examples of thermoplastics include polyethylene, polypropylene, and polystyrene. Thermoplastics are widely used in various applications, from packaging materials to automotive parts. Their ability to be recycled and remolded makes them an environmentally friendly option compared to other plastics. Additionally, they can be easily processed using techniques like injection molding and extrusion.