Interest groups influence public policy through various strategies, including lobbying, advocacy, and mobilization of public support. They represent specific interests such as business, labor, or environmental causes, aiming to sway lawmakers to align policies with their goals. Lobbyists often provide legislators with information, research, and expert testimony to support their positions, making them a critical resource in the legislative process. Additionally, interest groups engage in grassroots campaigns, encouraging citizens to contact representatives, thus amplifying their voice in political discourse. This interplay shapes legislation and governmental priorities, reflecting diverse societal interests.