Final answer:
The main function of a political party is to influence government policy by nominating candidates and winning elections. They also act as a linkage institution, translating the concerns of the people into law and policy. Political parties engage citizens by recruiting individuals to run for public office and promoting differing viewpoints through party platforms.
Step-by-step explanation:
The main function of a political party is to influence government policy by nominating its own candidates to hold seats in political office through electoral campaigning. Political parties work to create and implement policies by winning elections and forming a coalition. They also serve as a linkage institution, translating the concerns and desires of the people into law and policy. Additionally, political parties engage citizens by recruiting individuals to run for public office and promoting a collection of viewpoints or opinions through party platforms.