The document discusses the differences between human and animal communication. It notes that while animals emit sounds and expressions to communicate, human language possesses seven unique characteristics, including using grammar, communicating new ideas, and being passed down between generations. However, some primate studies have found that they share some human language traits. Overall, human language allows people to relate grammatical units to form an infinite number of understood sentences and ideas. For language to exist there must be physiological, grammatical, and semantic factors, including relating sounds to shared meanings between speakers.