Public speaking plays a vital role in the preparation for UPSC interviews as it helps candidates articulate their thoughts clearly and confidently. Practicing mock interviews enhances their ability to handle questions spontaneously and respond effectively. Good communication skills, cultivated through public speaking, reduce anxiety and build rapport with interviewers. Moreover, expressing ideas coherently can set candidates apart, showcasing their competence and readiness. Participating in group discussions or public speaking workshops can further refine these essential skills for a successful interview experience.