One-on-one meetings with members of Congress are personal discussions that take place between lobbyists or representatives of interest groups and individual lawmakers. These meetings are crucial for interest groups aiming to influence policy-making, as they provide an opportunity to present specific concerns, advocate for legislation, and build relationships that can be beneficial in shaping public policy. Through these interactions, interest groups can convey their viewpoints directly, enabling them to tailor their messages to the individual interests and priorities of the lawmakers they meet.