A language system encompasses the creation, learning, upkeep, and utilization of intricate communication forms, especially the unique human capability for language. Understanding a language system is crucial as it reveals how languages operate and how they are formed and structured.
It is important learn about Language System because we need to know how a language works, how it is formed and constructed
Finally the communicative aproach adds 2 more units:
Situational
functional
A language system consists of the development, acquisition, maintenance and use of complex systems of communication, particularly the human ability to do so.
In order to study a language it was subdivided by structuralism into the following parts: