Although things like clay and wax are bendy too, we use the word plastic to mean a group of manmade materials. They are made from chemicals that we get from oil.
Why is plastic useful?
Plastic is very useful because it can be coloured, melted, shaped, squashed, rolled into sheets or made into fibres.
There are lots of different types of plastic.
Polystyrene is hard and firm. It can be cut, glued and painted, but it breaks easily.