Answer:
Humans unlike animals are born with cognitive abilities that equip them with language learning and the ability to reason. The acquisition of language is the key characteristic that allows humans to give form to their thoughts and mental imagery using words.
The development of vocabulary with growth allows humans to connect to other human beings by communicating and expressing their emotions of sorrow, happiness, jealousy, admiration, honor, etc. and develop mannerism, etiquette, and learning the norms as well as ideologies perpetuated by the society. Thus, the language is the key tool through which humans not only differentiate themselves from animals but also evolve from a biological being to a social animal.