Plato, the eminent philosopher of ancient Greece, lived from approximately 428/427 BCE to 348/347 BCE. As a disciple of Socrates and a mentor to Aristotle, Plato's contributions laid the groundwork for Western philosophy and science. His works are written in the form of dialogues, in which characters engage in philosophical discussions, a literary form that he effectively popularized. In 'Theaetetus', one of his prominent dialogues, Plato delves into the nature of knowledge, exploring complex themes such as perception, reasoning, and epistemology. The dialogue presents Socrates in conversation with a young mathematician named Theaetetus, examining the question 'What is knowledge?' This dialogue, like many others penned by Plato, demonstrates his skill in blending dramatic elements with deep philosophical inquiry. Through his Academy in Athens, the first institution of higher learning in the Western World, Plato's influence extended well beyond his lifetime. His philosophical insights continue to be a cornerstone of philosophical education, with enduring relevance to metaphysics, ethics, and epistemology.