Pressure groups, also known as interest groups, play a significant role in influencing government policies by advocating for specific issues and mobilizing public support. They aim to impact legislation and public opinion through lobbying, research dissemination, and grassroots campaigns. By representing various sectors of society, such as environmentalists, labor unions, or business associations, pressure groups can bring attention to issues that may be overlooked by policymakers. Their activities shape the political landscape and can lead to significant policy changes, both positively and negatively.