The United States presidential election is held every four years to choose the country's president and vice president. Citizens aged 18 and older can vote for their preferred candidates, who are typically members of major political parties like the Democratic Party and the Republican Party. The election process includes a series of primaries and caucuses, where party members select their nominees. The final election takes place on the first Tuesday after the first Monday in November, and the winner is determined by the Electoral College, which allocates votes based on each state's population.