Language is arbitrary

We may ask why the same thing can be represented in different forms of different languages. The word "tree" in English, for example, refers to the same thing (concept) which is represented by the word "pohon" in Indonesian language, "wit" in Javanase language(one of languages used in Indonesia), and "sajarotun" in Arabic language. The examples above show that every speech community can create its own language (words). There are no agreements in creating the words. It means that there is no relation between a word (sound of word) and the message (meaning) a human being wishes. This phenomenon is called the arbitrariness of language. In other words, we can say that language is arbitrary.