Illusion of understanding. What are the reasons for people's misunderstanding?

We do not just communicate with each other and say something. The main thing is the meaning that we put into them. With our words and non-verbal manifestations, we all the time encourage a person to take some step: approval, reflection, response, action or inaction, and so on. But it happens that we do not get what we want, because the other one puts into our words the meaning that is closer to his perception of reality. Hence the reasons for the misunderstanding of people. And, conversely, the closer a person perceives this meaning, the more effective communication. Good communicators understand this, and prefer to speak in a "language of meaning". Because in reality we can want one thing, but say something completely different.