Political parties play several key roles in a democracy. They nominate candidates to run for political office to influence government policy. They help reduce diverse public opinions into clear policy platforms. If elected, they form and run governments by recruiting leaders to implement their agenda. Political parties also shape public opinion, provide access to government programs, and contest elections to allow citizens to select leaders and policies. However, parties often face challenges like a lack of internal democracy and dynastic succession that concentrate power among a few leaders.