Answer:
Primary elections are internal party processes that choose a political party’s candidate(s) for the next general election by holding an internal election. Exactly how this is done depends on the legal framework, internal party rules, and informal practices.
Primary elections are an example of a selection process with a high level of participation, meaning that ordinary members (or in some cases all voters in the electoral district) control the process.[1]
Arguments for primary elections
Those who argue for primary elections tend to say that:
Primary elections help the political party select the candidate who is most likely to win a general election by consulting a considerable number of those who are likely to vote for the party’s candidates.
Primary elections start the democratic process even before the general elections
Primary elections give the candidate(s) a clear mandate and legitimacy since the decision has been taken by party members in general and not only by the top leadership.
Primary elections give a party, its candidate(s), and perhaps even its platform significant public visibility.
Primary elections empower the ordinary members and engage them in party strategy and key decisions.
Primary elections help members overrule unpopular but entrenched party elites
Arguments against primary elections.
Step-by-step explanation:
Not sure if this helped any, but if not I can go into less/more detail if need be.