The constitution explicitly assigns the president the power to sign or veto legislation, command the armed forces, ask for the written opinion of their cabinet, convene or adjourn congress, grant reprieves and pardons, and receive ambassadors.
Popular vote is the amount of votes that exist nationwide and that can get cast during a voting process. In some countries it represents the number of electors while in some it represents the general population that has come of age and has voting rights. In history the number of voters was much lower since not everyone was a part of the popular vote.
A state that contains lots of electoral votes would want the smaller States that have fewer votes to vote because sometimes those small vote states are helpful. Also battle ground states are something to focus on when voting cause just like the last election it came down to this