Final answer:
Plato's most famous and influential dialogue is 'The Republic', where he discusses the concept of a just society through Socratic dialogues, covering various philosophical disciplines.
Step-by-step explanation:
Plato's most famous and influential dialogue is The Republic. In it, Plato, through the character of Socrates, explores the concept of justice and constructs an ideal society. Unlike his other dialogues such as The Symposium and The Apology, The Republic covers a vast range of philosophical topics, including epistemology, ethics, and politics, presenting a comprehensive system of ideas. The dialogue examines the just individual and the just city-state, questioning the nature of justice and the order of society. The influence of The Republic extends beyond philosophy into political science and education, and its exploration of the Socratic method underscores the importance of dialectic as a pathway to knowledge.