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The central question of this dialogue is the teachability of virtue. The dialogue calledProtagoras also delved into this question. Lest one think there's no benefit to be had from reading a second take on the subject, the ultimate answer in this dialogue is the opposite of that seen in "Protagoras." Socrates agreed with Protagoras that virtue was teachable. However, here Socrates concludes that it isn't, citing the fact that there are no viable teachers of virtue (ever the anti-Sophist,) and yet there are people who consistently behave virtuously.
[If one wonders how two of Plato's Socratic dialogues could feature completely different answers on the same question, the mid- and late dialogues are often thought to reflect Plato's personal views more than his teacher's. "Protagoras" is an early dialogue, while "Meno" is a middle dialogue. (It's also possible they weren't written by the same author as a number of dialogues attributed to Plato are in doubt.)]
I don't find Socrates's arguments on the subject at hand compelling. Socrates proposes that there are certain concepts that come pre-loaded into humans. He questions one of Meno's slaves on geometry to show that the slave seems to have a grasp of geometry without having ever been taught. Ultimately, Socrates concludes that a grasp of virtue is divinely installed in many people.
Still, there's lots of beneficial food-for-thought, particularly when Socrates differentiates knowledge and true beliefs / right opinions.