The function of a party whip in legislative processes is to ensure party discipline and cohesion. Whips are responsible for counting votes, relaying party leadership's positions, and mobilizing members for key legislation. They communicate party strategies to legislators, persuading or pressuring members to align with party goals. Additionally, whips play a critical role in fostering collaboration within the party and mitigating dissent. Their effectiveness can determine the success of legislation, making them vital in maintaining a party's collective agenda in a legislative body.