The life of Socrates is known mainly through?

Our most important source of biographical information about Socrates is found in the dialogues of Plato, Socrates' student. Also valuable are the Memoirs of Socrates by Xenophon, a contemporary. Two other friends of Socrates also wrote about him. Finally, there is a comedic parody of Socrates in Aristophanes' play, The Clouds. Historians ascribe varying degrees of reliability to these accounts.