Political parties are organized groups of people who share similar political beliefs and work together to influence government policy and decision-making. They play a crucial role in democratic systems by representing various interests and ideologies, allowing citizens to choose their leaders and shape their governance through elections. These parties can vary widely in their platforms, ranging from conservative to liberal ideologies. They often engage in campaigning, fundraising, and grassroots organizing to mobilize support. Notable examples include the Democratic Party and the Republican Party in the United States, each representing distinct political perspectives.