What is Verbal exchange?

A verbal exchange is simply a normal conversation. It could be simple,

e.g. passing by someone in the street and saying "Hello" and them replying back with a "Hi". It can also be complex, e.g. a 2 hour long debate.

You use them most effectively by always being polite, kind, and respectful, and really listening to what the other person is saying so that you can respond appropriately, instead of ignoring them and thinking about what *you* plan to say next.