Language is a highly elaborated signaling system. We call the aspects that are peculiar to it the design features of language. Some of these we find only with the language of human beings, others we have in common with animals. Another aspect of human language is that we express thoughts with words.
Talking, shouting, whispering, lying, swearing, telling jokes or tales, in short: communication of all sorts by means of articulate sound is something we are so familiar with that we hardly ever come to think about it as something unique.