Closed Primary: A type of primary election where only registered members of a particular political party can vote. It's like having an exclusive club meeting where only members can participate.
Open Primary: An open primary is an election that does not require voters to be affiliated with a political party in order to vote for partisan candidates. It’s akin to an open house event, anyone interested can come and participate regardless of their affiliation.
Caucus: A caucus is a meeting at which local members of a political party register their preference among candidates running for office. It's like a team huddle where the game plan is discussed and decided.