What electoral system does the US use?

The US uses first-past-the-post electoral system in which the highest-polling candidate wins the election. The president and vice president are not elected directly by citizens. Instead, they’re chosen by “electors” through a process called the Electoral College. In other U.S. elections, candidates are elected directly by popular vote.

Further Reading:

• Political Parties And Pressure Group
• List of Political Ideologies