How did plato's opinion of democracy differ from that Socrates? Why did it differ

Plato was actually a student of Socrates. Their ideals were almost similar but they did differ as far as their opinion on democracy was concerned. Socrates was a great believer in democracy. He was of the opinion that the people possessed real knowledge and all good things were within the people. So he believed that democracy was the only way to gain happiness. Plato on the other hand did not believe in pure democracy, but he believed in Republic Democracy, which is a mixture of democracy and oligarchy.