What makes human language unique

Human language is unique in comparison to other forms of communication, such as those used by animals, because it allows humans to produce an infinite set of utterances from a finite set of elements,[7] and because the symbols and grammatical rules of any particular language are largely arbitrary, so that the system can only be acquired through social interaction. The known systems of communication used by animals, on the other hand, can only express a finite number of utterances that are mostly genetically transmitted.[8] Human language is also unique in that its complex structure has evolved to serve a much wider range of functions than any other kinds of communication system.