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The purpose of primary elections is to choose the candidates for the main elections.
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Political parties use primary elections to determine who they will nominate to represent the parties in the general elections. In the general elections, voters choose from among candidates of various political parties their preferences to fill government offices.
Such is the purpose of primary elections. Candidates may also be determined by caucuses and state conventions.
Perhaps you are referring to the party caucuses and primary elections that choose the candidates.
Countries that use primary elections include the United States, where various states hold primaries for presidential and congressional candidates, and France, which utilizes primary elections for selecting candidates for presidential elections. Other examples include Mexico, which conducts primaries for its political parties, and Brazil, where primaries are used to determine candidates for local and national elections. These elections help parties gauge voter support and select their representatives.
Primary elections are preliminary elections for the purpose of choosing the candidates for the main elections that actual choose the office-holders. The term "state primary" may refer to an election held within a state to choose candidates for the presidential election or it may refer to primaries held to choose candidates for state offices.
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A non paricant primary is a primary where candidates are not labeled under a party. It may also be called an open primary.
California holds primaries, specifically a top-two primary system for most elections, including presidential primaries. In this system, all candidates appear on the same ballot, and the two candidates with the most votes advance to the general election, regardless of their party affiliation. California does not use caucuses for its elections.