The subject of this thesis is the analysis of Plato’s analogy of the divided line and it’s metaphysical, gnoseological, ethical and educational character. The goal is to analyze The Republic, with focus on the analogy of the divided line and show different theories surrounding it, by using analytical and synthetical methods. The nature of knowledge, and the implications it puts forward concerning the notions opposite to it. By analyzing the analogy between the Sun and the form of good, it is understood that the Sun enables the tactile objects their existence and cognizance, so does the form of good. It enables human reason to obtain cognizance while it also enables cognizance to the objects of human cognition. Plato’s divided line is divided into four parts with their corresponding degrees of cognizance and the objects of cognition. Many interpreters contributed to the interpretation of the analogy of the divided line and the meaning of its most important parts. One theory introduces the world dualism where the sensory or tactile world exists apart from intelligible world, whereas the other theory considers the four parts of Plato`s line as connection between the degrees of cognition and reality. The difference and vastness of different interpretations of Plato’s analogy of the divided line paint the relevance of it for whole Plato’s philosophy.