What are the two different parts of primaries and what do they do?

Primaries consist of two main types: open primaries and closed primaries. In open primaries, voters can choose which party's primary to participate in, regardless of their registered party affiliation. In contrast, closed primaries require voters to be registered with a specific party to vote in that party's primary. These systems determine how candidates are selected for the general election and can influence voter turnout and party dynamics.