Most of what we know about Socrates comes from Plato, his most famous student. Plato called Socrates "the best of all men I have ever known". "The Apology" is Plato's version of the speech given by Socrates as he defends himself against the charges of being a man "who corrupted the young, did not believe in the gods, and created new deities". "Apology" here has its earlier meaning of a formal defense of a cause or of one's beliefs or actions.
"Crito" is a short but important dialogue that relates a conversation between Socrates and his wealthy friend, Crito, regarding justice, injustice, and the appropriate response to injustice.
Plato described his idea of an ideal society in his most famous work, the Republic. In the first two books, Socrates sets out to define justice and the most just way of governing.