A plastic is a material that can change its shape easily. Many things are made of plastics, usually because making them to the right shape is easy.
Some plastics have other materials added to them, like glass, because they make the plastic stronger and stiffer.
Plastics are used to make many products, including nylon or polyester clothing; toys; electronics; food containers; pipes; bags; parachutes; ropes; car parts; medical supplies; bulletproof glass; and body armor.