Effective communication skills enhance a candidate's UPSC interview performance by fostering clarity and articulation of thoughts. They enable aspirants to confidently express their opinions and navigate challenging questions. Good communication also involves active listening, which is essential to understanding the interviewer's queries and responding appropriately. Furthermore, the ability to engage effectively with examiners can leave a positive impression, showcasing the candidate's preparedness and knowledge. Practicing mock interviews can improve these skills significantly, helping aspirants convey their points succinctly and convincingly.