Thermoplastic resins are a type of plastic that becomes soft and moldable when heated and hardens upon cooling. This property allows them to be reshaped multiple times without losing their original qualities. Common examples of thermoplastic resins include polyethylene, polypropylene, and polystyrene, which are widely used in packaging, containers, and various consumer products. These materials are popular in manufacturing because they can be easily processed using techniques like injection molding and extrusion. Additionally, thermoplastic resins are recyclable, making them an environmentally friendly choice compared to some other plastics. Their versatility and ease of use contribute to their widespread application in many industries.