Interest groups play a pivotal role in shaping legislative agendas by representing specific interests and mobilizing advocacy efforts. They conduct research, lobby lawmakers, and contribute to political campaigns to influence policy decisions that align with their goals. By providing expertise and resources, these groups can sway public policy in areas like environmental regulations, healthcare, and education. Their ability to galvanize public support or counteract opposition also makes them powerful stakeholders in the policy-making process, highlighting the interplay between politics and interest representation.