It is a good indicator of a healthy or decrepit culture. All species communicate amongst themselves. Humans have evolved with the ability to do so through a complex system of vocalizations, gesticulations, and expressions, which are able to transmit highly complex thoughts and feelings. The vocalizations, or languages, have co-evolved along with the human species. Much of the groups abstract reality is transmitted through language.
Every language is a sophisticated means of labeling the reality for communication purposes.
Language becomes a part of the mind, thus yoking the mind to the reality and the individual to the culture. In this way, languages also contribute to the separation of the species in scope. Scope is our self-interest expanded to include others, such as family, friends, tribe, and nation. Unfortunately, this inclusion also leads to exclusion, which is the human trait of limiting their tribe or culture. Us and them.