The Electoral College is a way that the United States Votes for a President.
Each State gets an amount of electoral votes that the senators and the house of representatives give them, Pennsylvania has usually 20.
There is a map of all the states and they all have a certain amount of Electoral Votes er state.
Pros of electing through the Electoral College are it is easier to go for the bigger numbers and get the states with bigger numbers to campaign, but you don't want to forget about the small ones because they could win you the election.
The Electoral College is the way that we vote to get 270+Electoral Votes for a new President.
Cons of electing through the Electoral College are that if you loose in a state by a little bit you can loose all the Electoral votes and get nothing even if you tried your hardest to win in that state.