A Public Interest Group is an organization that advocates for issues affecting the general public, such as environmental protection, consumer rights, or social justice. These groups aim to influence public policy and raise awareness about specific concerns that impact society as a whole. They often engage in activities like lobbying, research, and grassroots campaigns to promote their causes. Public interest groups can vary in size and scope, ranging from large national organizations to smaller local entities. Examples include the Sierra Club for environmental issues and the American Civil Liberties Union (ACLU) for civil rights. Their efforts help ensure that diverse voices are heard in the policymaking process.