Interest groups are organizations that aim to influence public policy on specific issues. They represent diverse segments of society, from labor unions to corporations, and engage in lobbying to shape legislation and government decisions. These groups play a crucial role in American democracy by providing expertise and mobilizing public opinion. Interest groups form when like-minded individuals unite to advocate for shared concerns. They establish formal structures, hire professional staff, and employ various tactics to influence policy. These include direct lobbying, grassroots mobilization, coalition building, and political contributions. Interest groups differ from political parties in their focused approach to specific issues.