Rather than presenting a marked difference between plastics and polymers, it should be emphasized that polymers are a group of compounds that encompass large molecules formed by the union of covalent bonds. Within the polymers there are some subgroups, these subgroups are classified according to the properties that the polymer has and its origin. They can come from natural or synthetic sources.
Plastics are a subgroup of synthetic polymers that possess temperature-sensitive properties, that is, they deform at a certain temperature, so their molding is done with heat.