A pressure group, also known as an interest group or advocacy group, is a group of individuals or organizations that come together to influence government policies and decisions on a specific issue or cause. These groups use various tactics, such as lobbying, public demonstrations, and media campaigns, to put pressure on policymakers and bring attention to their cause. Pressure groups can represent a wide range of interests, from environmental protection to business interests, and can have a significant impact on shaping public policy. However, they are not elected or accountable to the public, and their influence can sometimes be seen as undemocratic.