The format of the UPSC Civil Services Interview round primarily includes a panel of experts posing questions to candidates. It assesses aspects like personality, general knowledge, and suitability for public service roles. The interview is often structured around the candidate's profile, including educational background, hobbies, and current affairs. Each candidate typically has about 20-30 minutes in front of the panel, and the informal nature encourages candidates to showcase their knowledge and thought processes, determining their fit for the competitive civil services environment.