What's the difference between a caucus and a primary?

Question

Iowa Caucus. New Hampshire Primary.

What's the difference? And what happens at both?

Answer 1

A caucus is most generally defined as a meeting of supporters or members of a political party or movement.

A primary election is an election in which voters in a jurisdiction select candidates for a subsequent election (nominating primary). In other words, primary elections are generally when each political party decides its nominee for the upcoming general election.