Many people can express several communicative signs around the world, but language is the closer way to speak or spread a certain knowledge.
When someone begin to acquire your native language, it listens sounds about these words and learn the correct meaning. Then, we can learn a foreign language from initial phonetics words roots. Firstly, a person listen, repeat and understanding the main idea on it. Grammar and linguistics aspects are important too, but this kind of knowledge is getting after all these experiences.