Why is fire called "fire"? Is the naming completely arbitrary? Do we use the term because our ancestors agreed on it, or is there some kind of natural correctness to names? Plato discusses this in his dialogue 'Cratylus', the first major systematic work of philosophy of language. The participants in the conversation around Socrates attempt to gain insights into the nature of words through etymological investigations of individual terms and to define criteria. They also pose the question of whether it is even possible to make statements about the correctness of words.