Human communication is a unique and highly developed system that enables people to exchange ideas, emotions, information, and experiences through language and other symbolic forms. It differs significantly from animal communication because it possesses several distinctive features that make it flexible, creative, and capable of expressing both concrete and abstract concepts. Understanding these features is essential in the study of language and the learner, as communication forms the foundation of learning, social interaction, and cognitive development. One of the most important features of human communication is arbitrariness. The relationship between words and their meanings is generally arbitrary. There is no natural connection between the sound of a word and the object or idea it represents. For example, the word "tree" does not resemble the actual object. Different languages use different words for the same object, showing that meanings are assigned by social convention. Another significant feature is productivity or creativity. Human beings can produce and understand an infinite number of new sentences using a limited set of sounds,