Public interest groups are organizations that advocate for issues affecting the general public, such as environmental protection, healthcare, and civil rights. They aim to influence policy decisions and raise awareness about specific causes, often representing the interests of marginalized or underrepresented communities. These groups can be non-profit organizations, grassroots movements, or coalitions of various stakeholders. These organizations engage in activities like lobbying government officials, conducting research, and mobilizing citizens to participate in campaigns. By doing so, they seek to promote social change and ensure that the voices of the public are heard in the political process. Examples of public interest groups include the Sierra Club and the American Civil Liberties Union (ACLU).