What is Socrates' concept of 'Virtue is Knowledge'?

Socrates' 'Virtue is Knowledge' Doctrine:

• Core Assertion: True knowledge of what is good leads to virtuous action; no one does wrong willingly (ignorance is root cause of vice).
• Socratic Method (Dialectic): Questioning & dialogue to uncover innate moral truths and remove ignorance.
• Unexamined Life: Famously stated that 'An unexamined life is not worth living'.