http://www.scaruffi.com/science/language.html
Ultimately, "communication" is about one brain trying to replicate some kind of neural pattern into another brain. Language uses sounds (or written symbols) to induce such a mental replication. Those sounds (symbols) are structured in such a way as to interact with the neural process of the other brain and cause it to create a specific neural pattern (that’s what we call "understanding"). This is an error-prone process that requires a lot of interaction, due to the fact that each brain is slightly different. But the goal is to eventually transmit a neural pattern from one brain to another. That pattern could be a scene or a story, if we are "narrating" something, or it could be a belief if we are trying to "convince" of something, or a concept if we are trying to explain something, etc. It is a pattern that already exists in our brain and we want to recreate it in the brain of our interlocutor.