Plastics are synthetic materials made from polymers, which are long chains of molecules. They are created through a process called polymerization, where small molecules called monomers are chemically bonded together. Plastics are lightweight, durable, and can be molded into various shapes, making them popular for a wide range of products, from bottles to toys. There are many types of plastics, each with unique properties. For example, polyethylene is commonly used for shopping bags, while polyvinyl chloride (PVC) is often found in pipes and flooring. Despite their usefulness, plastics can be harmful to the environment if not disposed of properly, leading to pollution in oceans and landfills.