Answer:
Including a counterargument, means that you summarize a major opposing view to your own main argument. Counterargument is one of the great missed opportunities by high school and college writers.
This is understandable, because including a counterargument may feel like you are weakening your own argument.
A counterargument, however, will dramatically strengthen your writing. It’s also a great way to finish an essay. So rather than writing one of those lame, “In conclusion” sorts of conclusions where you simply repeat everything you’ve already said, you leave your reader astounded at your ability to introduce new material by nailing the chief opposing argument to your own.