Interest groups influence political decisions by lobbying government officials, contributing to campaign financing, and mobilizing grassroots support. They represent specific interests, such as business, labor, environmental issues, or social causes, aiming to shape policies that align with their agendas. Through research, advocacy, and public campaigns, these groups can affect public opinion and persuade lawmakers to consider their perspectives in decision-making processes. Their pragmatic engagement in the political system highlights the intersection between democracy and organized interests, impacting legislative outcomes.